concern vs have to do with

concern is a noun but have to do with is not a noun.

Word	Noun	Adjective	Verb	Adverb
concern	Yes	No	Yes	No
have to do with	No	No	Yes	No

As verbs, concern and have to do with are synonyms defined as:

Other synonyms of concern include bear on, come to, pertain, refer, relate, touch, touch on.

concern (noun)	have to do with (noun)
something that interests you because it is important or affects you
something or someone that causes anxiety; a source of unhappiness
a feeling of sympathy for someone or something
an anxious feeling
a commercial or industrial enterprise and the people who constitute it

concern (verb)	have to do with (verb)
be relevant to	be relevant to
be on the mind of