Give a try to this.

Assuming that in B2 starts the list of sentences. In Sheet 2!(i named it "Key Words) in A2:A66 exist the KEY words..

Then in C2 of your first sheet put this and copy down.

=LOOKUP(2^15,SEARCH('Key Words'!$A$2:$A$66,B2),'Key Words'!$A$2:$A$66)