Google vs EM Client search results

I have been testing the EM Client for the last 2 weeks and one of the difficulties I have been having is searching. I have had to rely on web based Gmail to help search for keywords which I can not find in em client. using asterisks have not helped nor using operators for searching. Please advise if I am doing something odd about my searches. For example normally in Google gmail I would use a “person” “topic” in the search query and get a list to choose from but in EM Client I don’t get any results.
Thank you