Can I say " I do work for knowledge and money"
by add verb to do to emphasise the sentence

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For writing or for any formal context, you would do better to find another way to give emphasis.

Because "work" is both a noun and a verb, the way you have it is easily misunderstood as "I carry out this piece of work" - I do (verb) work (noun).

You could consider: "The reason that I work is for the intellectual stimulation and the money." Or, "Knowledge, and money: these are the reasons why I work." Or, using a sentence adverb: "Really, I work for the knowledge and the money."

This use of "to do" for emphasis is perhaps better reserved for use as a contrast to something; a question, a challenge, an alternative.
"You don't work for the intellectual challenge."
"I do work for the intellectual challenge - and the money. "

https://www.thoughtco.com/what-is-the-emphatic-...
https://en.islcollective.com/english-esl-powerp...

https://www.lexico.com/grammar/sentence-adverbs