If I buy a one day park hopper ticket , can I go to Disneyland side and California adventure more than 1 time ? Like say I want to go to Disney side then California adventure , then go back to Disney to ride the same rides , can I go multipe times ?

Yes. A park hopper will let you go back and forth as many times as you want for that day.

You can go either the Disneyland, or the Adventure, but you can't take them both, you need to choose one, as once you enter one park, you would not allowed to enter the other one...that's how daypass ticket works.