Search database - workflow configuration

What are you trying to achieve?

My goal is to input a list of items in Google doc seperated by semi-colon (i.e. item A; item B; item C).

Then, I wish the workflow can help me to search item by item within my database, which the database is in form of google sheet and includes over thousand individual items.

I wish the workflow can help me to match / search item by item whether each of the items are included in the database. If yes, tell me. If no, tell me the similar items.

Steps taken so far

I have no idea which moudles I should include and play around. So, hope anyone can advise me the direction or workflow configuration.