Here's a handy trick you should know and use. To find variations of words easily, you can use truncation and wildcards.
Truncation typically goes at the end of a word root and means "find any number of letters in this spot". Sometimes it can be used with a word, also.
Wildcards are typically used 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.