Most databases have ways to account for endings of words (truncation) or to substitute for letters (wild cards). Most databases will use * (the asterisk) to be added to the root of the word to account for variations in endings:
manag* will find management or managing or manager or managers or managed or manages - you get the idea.
Put the asterisk where the letter variation will begin-just don't make the root too small. You don't want to see the results for man* !!
Most will also use ? to substitute for a letter
defen?e
manage?
Check the Help on the database you're using to make sure you're using the correct symbol for truncation or letter substitution.