If you suffer from "keyword search burnout," there are other methods for finding material. These methods should be regularly employed as part of your search process.
A search strategy is an organized combination of keywords, phrases, subject headings, and limiters used to search a database.
Your search strategy will include:
keywords
boolean operators
variations of search terms (synonyms, suffixes)
subject headings
Your search strategy may include:
truncation (where applicable)
phrases (where applicable)
limiters (date, language, age, publication type, etc.)
A search strategy usually requires several iterations. You will need to test the strategy along the way to ensure that you are finding relevant articles. It's also a good idea to review your search strategy with your co-authors. They may have ideas about terms or concepts you may have missed.
Additionally, each database you search is developed differently. You will need to adjust your strategy for each database your search.
This page includes information about some advanced searching techniques which will aid your research.