i live in iowa the police performed a search warrant no one was there 3 people live there but i was charged.my main question is i know they can enter if no ones there but can they search if no one there

Law Enforcement with a search warrant can search whether or not the residents are home. The more important question is if no one is at home, how did the police determine who to charge with a crime.  You need to contact an attorney to determine if the search results can be suppressed and whether your rights were violated in any way.