Leave No Stone Unturned

Example 1: 

When Bobby went to the park with his family, his father accidentally dropped the keys to the car. For more than an hour, the whole family was searching for them. Bobby's mother instructed them to "leave no stone unturned, we need those keys to get home!" So the family searched in all possible places until Bobby's sister found them near the car. After that, the family could relax and enjoy the park.

Example 2:

The police is the city left no stone unturned  in the search for the missing bank robbers. All leads were investigated and every contact was questions. The police had almost exhausted all of their resources when the thieves were  found in Mexico living in luxury.

Explanation:

The expression to leave no stone unturned means to use all your power, energy, and resources to find something/one. In example 1, Bobby's family had to literally look under and around every stone in the park until the missing keys were located. In example 2, the police searched everywhere and followed all leads until the thieves were located. 

http://languagesystems.edu/

Let the chips fall where they may

Example 1: 

Dad: Hey Johnny, it's almost 3 o'clock. Your guests should be arriving soon.

Johnny: Dad, I'm not popular. I bet no one will come. I invited everyone in my class to the party, but I bet we'll be here alone. 

Dad: Well son, I think you're a great kid and it was nice that you invited everyone. Let the chips fall where they may. If only a couple of people come, great. If everyone comes, great! We will have a good time either way. There's no sense in worrying about what you cannot control.

Example 2:

Stan placed a $200 bet on the last game of poker. He didn't know if he could win or not. His whole attitude was to let the chips fall where they may while he was staying in Las Vegas. 

Explanation:

Imagine throwing up a handful of small plastic chips. There is no way to control where they will fall. The expression let the chips fall where they may is a way of looking at and dealing with life that accepts its randomness without too much worry. It can also be used when one isn't concerned about the outcome of their actions. This expression can be used when you or someone else is preoccupied or anxious over something you have no control over.

http://languagesystems.edu/