To successfully search the literature, you need to understand the language and terminologies used by the scholars in your research field. This will enable you to identify the keywords you need to use to return relevant documents.
You will have already identified themes/concepts to your research and some relevant keywords through preliminary searches. Begin by grouping these keywords under each theme/concept. You can expand your keywords in several ways:
Note: be selective with the synonyms you use. For example, in gender studies you would not generally use the term ‘ladies’ but instead use terms such as women, woman, female, etc. Also consider how broad the meaning of your keyword is, e.g., some words are homographs (they are spelled the same but have a different meaning). For example, competition could mean rivalry or a contest. Bat could be a mammal or a sporting instrument. You may therefore need to add context to ensure you are not returning irrelevant results.