The keyword group option allows you to set up monitoring searches that require combinations of search terms without having to create multiple topics for the different variations.
The below demonstrates an example of how multiple requirements can be built in to a single topic.
Say I want to search for
British Airways AND Strike OR dispute OR walkout
but British Airways is also known as British Airlines Association or BALPA.
The above can be constructed into a single topic using the keyword group option (see below) this method will not require you to create 3 individual topics for the different variations, but can rather be done into a single topic as per below.