leave no stone unturned

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Longman Dictionary of Contemporary English

leave no stone unturned  

to do everything you can in order to find something or to solve a problem :  
Jarvis left no stone unturned in his search to find the ring. 

Oxford Advanced Learner's Dictionary

 leave no stone unˈturned
to try every possible course of action in order to find or achieve something

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

leave no stone unturned

C2 to do everything you can to achieve a good result, especially when looking for something:

He left no stone unturned in his search for his natural mother.

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