有劳

有劳	yǒu láo	(polite) thank you for your trouble (used when asking a favor or after having received one)
有	yǒu	to have; there is / (bound form) having; with; -ful; -ed; -al (as in 有意 intentional)
劳	láo	(bound form) to toil; labor / (bound form) laborer / (bound form) meritorious deed / (bound form) fatigue / to put sb to the trouble (of doing sth) / to express one's appreciation (Taiwan pr. [lao4])