He looked down, and seemed to be searching for words.

He makes a gesture with his hands, searching for words.

Her mouth worked as if she was searching for words that would not come.

The little man seemed to be desperately searching for words.

Sales searched hard for words in trying to explain her game.

Curtis was still searching for words when she killed the call.

She searched for words to explain, but could find none.

She opened and closed her mouth several times, searching for words.

Again, he searches for words, but can do no better than to throw the same ones back.

He searches for words that are never going to come.