Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach tu » khach deu, khanh thu, hanh tu
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
tu ang » tu lang, tu anc, tu anh
ang xa » lang xa, mang xa, dang xay
va cam » va cham, va cac, va cao

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 tu ang xa hoi. hieu va cam luc ((va hanh) or (van hanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach tu ang xa hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre.
• Adding a wildcard symbol may retrieve word variants: vu khach tu ang xa hoi. hieu va cam luc ((va hanh) or (van hanh)) tri cua tre*.