thỉnh cầu 
to ask, request; request [ thỉnh ] : to ring to invite politely
[ cầu ] : (1) bridge; (2) to request, demand, desire; (3) toilet; (4) sphere, ball; birdie (badminton)
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
thỉnh cầu to ask, request; request