You can get research help any time, day or night. Right now (during the pandemic lock down) it's through a chat service. You can find links for "Ask a Librarian" on the Library Home Page, or use:
Find the root word with any ending:
To find rehabilitation or rehabilitate or rehabilitating or rehabilitated, search the root of the word followed by the truncation symbol: Example: rehabilitat*
Note: When you use "or" it is wise to force the set - put parentheses around the terms you want grouped.
Example: arthritis and "physical therapy" and ("motor function" or movement)
If you find an article that is exactly on topic, look at its indexing (subject headings or descriptors). Find the ones that apply to your topic and use those in a subject field search to find everything in the database that is focused on that topic.