Instead of typing in all the possible variations in spelling or endings of a word, most databases allow you to use truncation symbols, also called wildcards, to represent any letter. The most common trunctation symbols are:
* - the asterisk represents zero or more characters and is usually used at the end of a word.
? - the question mark represents one character and can be used at the end or in the middle of a word.
Your list might now look something like the following:
Concept 1 and 2
(Antony OR Cleopatra)
(power OR politic* OR rome OR roman)
Using the asterisk at the end of shakespear* will pick up variations such as shakesperean or shakespeare, william. Similarly, politic* will pick up politics, political, politically or politician.