How to figure seach API and autocomplete

Iam using search API and autocomplete to show my search result live, but it seems i cant manage it to work as i wish.

lats say i have a node with title “print my paycheck”
So this whats happening:

seraching for the word “print” return the node
seraching for the word “my” don’t return anything
seraching for ether “pay” or “check” do not return anything ether
seraching for “paycheck” did return the node

So my question is, why do words like “my”, “pay” and “check” return nothing, when it clearly are letter combinations used in the node tittle.
Anyone know how to achieve a more user friendly search result?

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