Almost every modern website has search feature and it must be carefully and thoroughly tested. You will know from this post how to do it using JMeter.
First record necessary HTTP requests (including search page and search results page) using JMeter's recording proxy and group them into separate transactions.
Then go to HTTP Request sampler which corresponds to search results page and replace the keyword (which you used during recording) with some variable name, e.g., ${KEYWORD}.
Then prepare the list of keywords you want to use for search testing, save them to the text file and add CSV Data Set Config element to Thread Group. Specify the name of just created file and the variable name which will contain your keywords from file, e.g., KEYWORD (see above).
Now you are ready to test the search on your website.