The phrase "have to do with" is used to describe a connection or relevance between one thing and another. There are several synonyms for this phrase that can be used interchangeably, including "relate to," "concern," "pertain to," "be associated with," "touch on," "deal with," "refer to," and "connect with." Each of these phrases implies a similar meaning, but may be more appropriate depending on the context in which it is used. For example, "deal with" might be more appropriate in a business setting where a problem needs to be addressed, while "connect with" might be more appropriate in a personal context where emotions are involved. Regardless of which synonym is used, each implies a connection or relevance between two things.