Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
cao hoi » cau hoi, co hoi, cao hoc
hieu le » hieu ve, hieu he, hieu ly
vai cua » dai cua, hai cua, lai cua
thu va » thuc va, thue va, thu ha
vi cua » di cua
le ta » le tai, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ky nang cao hoi. hieu le ta ((thu va) or (tu va)) hanh ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang cao hoi. hieu le ta ((thu va) OR (tu va)) hanh ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang cao hoi. hieu le ta ((thu va) or (tu va)) hanh ((vi cua) or (vai cua)) viet*.