⓪ I’ll give you what money I have.

= I’ll give you all the little money that I have.

① What (little) money he has, he spends on drink.

② I’ll give you what help I can.

= I’ll give you all the little help I can (give you).

③ What little he said on the subject was full of wisdom.

④ Though you could not have said that his manner was cordial, it was plain that he was ready to be of what service he could.

= Though you could not have said that his manner was cordial, it was plain that he was ready to be of all the little service he could be of.