Here's a handy trick you should know and use. To find variations of words easily, you can use truncation and wildcards.
Truncation goes at the end of a word and means "find any ending at all for this word".
Wildcards are used within a word, to represent any one letter.
Example: "wom?n" finds "women", "woman", "womyn"
Truncation and wildcards are extremely helpful for searching, and should never be forgotten. They'll save you time and improve your results.
However, many databases now provide automatic truncation, seamlessly searching for alternate spellings. When this is the case, using your own truncation overrides the system default. It's often best to try your search without truncation first, and then use it if you need to control the search more accurately.
Unfortunately, the symbols used in different databases can vary.
You can check under "Help" for the search engine you are using, to see exactly how these symbols are interpreted.