Search will return results which contain any of the terms entered.
Example: 'I do business stuff' (without quotes) will find items which contain either 'I' or 'do' or 'business' or 'stuff'.
For an exact match, enclose in "".
Example: "I do business stuff" will find only pages which contain the phrase 'I do business stuff' (without quotes).
Results won't include instances where a word in that phrase is bold/italic/linked (because of the html tags).
There's no fix for this, and we'd rather you knew.