Good keywords for searching come from your own topic, expressed as a clear question or declarative statement; from earlier searches; from talking to your faculty; or from reading.
Refining a search is like editing a draft. You have to really look at what you've got, as above, and make changes.
Sometimes an assignment calls for sources beyond books and journals. Check the research guides for tabs that contain:
If you need research help or have a question about the library during normal business hours, try chatting with a Research Librarian (general questions, research questions, library resources) or with the College Archivist (campus and local history, special collections, etc.)