If we ask others for help and they happen not to be of any assistance, we may say "Anyway, thank you", or "Thank you, anyway". Of course, this is common sense and we should not show off using these simple English sentenses.
Occasionally, we may hear people say " Thank you, though." I can bet not all the Chinese Engish speakers know this fact. Of course, it is not a big issue for us if we have not noticed such an expression.