Leave no stone unturned
Definition 1 of 1
Pro Tip 1/3Total Commitment
Implies a deep dedication to finding a solution or attaining a goal. 
For her research project, she left no stone unturned to find the original documents.
Pro Tip 2/3Metaphorical Use
Used figuratively to express a thorough search, not literally turning over rocks. 
The detective left no stone unturned in hunting for clues.
Pro Tip 3/3Intensive Effort
Suggests very intense and exhaustive efforts have been made. 
The team left no stone unturned in their preparation for the championship game.