“I don't think that skinny bochur has the koyach to carry his own seforim.” (Weiser)

“Only the Mashgiach has the koyach to change the curfew for the dorm.” (Weiser)

“As long as he has the koyach to communicate, I wouldn't assume him to be stupid.” (Weiser)

“I'm so tired that I don't even have the koyach to brush my teeth and put on my pajamas.” (Weiser)

“A fund-raiser needs to have the koyach to speak publicly.” (Weiser)

"May Hashem grant you health and koyach so that you can contuine in your noble avoidas hakodesh." (source)