The man probably just couldn't find the words to thank you.

I will never have enough words to thank what he has done for me.

I could scarcely find words to thank him with, but managed to say something.

Their last words before death are usually "thank you."

"I have no words to thank you enough, both of you."

I dropped to the ground before him, trying to find the words to thank him.

"We expect each guest to hear the words 'thank you' at least 30 times in the course of their visit."

I'll never have enough words to thank him for all he's done for me.

The words please and thank you were absent from the children's conversations.

Her lips moved to make the words thank you, but no sound came out.