Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
sang tai » hang tai, sang tao, tang tai
hieu cua » hieu qua, dieu cua, bieu cua
ky sang » ky nang, ky dang, ky tang
tai hai » thi hai, dai hai, tai ha
vai cua » dai cua, hai cua, lai cua
xuc va » tuc va, luc va, xac va
vi cua » di cua

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 sang tai hai. hieu cua cac ((xuc va) or (duc va)) danh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky sang tai hai. hieu cua cac ((xuc va) OR (duc va)) danh ((vi cua) OR (vai cua)) te.
• Adding a wildcard symbol may retrieve word variants: vu khach ky sang tai hai. hieu cua cac ((xuc va) or (duc va)) danh ((vi cua) or (vai cua)) te*.