Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham vuc » cham soc, pham duc, cham cuu
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
vuc van » duc van, luc van, thuc van
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((o hoi) OR (x ho)). hieu ve cham vuc van hanh ((di cua) OR (de cua)) tre~.
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((o hoi) or (x ho)). hieu ve cham vuc van hanh ((di cua) or (de cua)) tre*.