Gender Studies is an interdisciplinary field and may require keywords the aspect of the gender issue combined with keywords related to multiple disciplines (history, politics, medicine, literature, etc.). The ideas below will help get you started. If you need further help with keywords, talk to your professor or set up a research appointment with a librarian.
Note: Terminology in Gender Studies evolves much faster than terminology in databases. You will likely come across outdated and possibly offensive subject descriptions. However, it may be necessary to use such keywords in order to find the research you need.