There are lots of helpful websites that focus on intercultural pragmatics, or otherwise provide a wealth of information on statistics, general information, and data that would all be helpful for your literature review.
Google can be an incredibly useful resource. Google itself has become synonymous with web searching. It is famous for its simple search box, but Google also has more sophisticated tools that can help you get more of what you want rather than just what Google thinks you want. I recommend using the Google Advanced Search options/interface, but many of these advanced features can be used by including special text operators in the regular search box.
| " " | Search keywords together as a complete phrase (e.g. "food truck"). |
| * | Use an asterisk as wildcard or a placeholder (e.g. "market * report"). |
| - | Use a dash to exclude a particular keyword from your search (no space between the - and keyword) (e.g. "moon landing" -hoax -site:.com). |
| .. |
Search a number range (no spaces between the .. and your numbers) (e.g. "2000..2010" for a range, "..2000" for dates or numbers less than / before 2000, or "2000.." for dates or numbers greater than / after 2000). |
| OR | Search one or another keyword (this will get you more results) (e.g. Country OR Western). |
| site: | Limit your search to a specific site (no space after :) (e.g. "food trucks" site:cnn.com | or site:.gov (for government sites only)). |
| filetype: | Limit your search to files with specific extensions, such as PDFs, PPT, etc. (e.g. "food trucks" filetype:pdf). Here is a list of file types indexed by Google. |
| inurl: | The term appears in the URL of all results. |
| intitle: | The term appears in the title of the webpage search results. |
| AROUND(#) | Search terms that appear within a certain # words from each other (e.g. defibrillator AROUND(5) law) |
The "site:" and "filetype:" operators will be particularly useful for finding academic sources related to pragmatics. Often professors will publish open access versions of their research or you can find doctoral dissertations and master's theses which may have incredibly useful bibliographies which you can use to determine useful sources for your own research.
Google Scholar is a great place to look for scholarly articles through Google. Remember though, not all of the articles will be free. Though many results will link to resources available through the library, if any ask for money, remember that you can always request those resources through the library's Interlibrary Loan (ILL) service. Do not pay for anything directly, the library has you covered.
Great source for open-access journal articles and articles in institutional repositories (like Digital Commons); plus, you might pick up an article or two that wasn't indexed by our databases. Google Scholar also lets you "forward search" an article to determine what other, later publications cited it. To do this, search the title of the article, then follow the "Cited by" link under the citation. Forward searching can be especially useful if you find a relevant article that is a little too old for your purposes.
You can also use Google Scholar to find articles in other languages. When using Google Scholar, click the three bars at the top left of your screen, select the Settings option, and then select the Languages tab. Here you can change both the interface language (great for practice), and change the language(s) of your search results. This link should also open your language settings.