Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
ly hang » ly quang
ly vang » ly van, ly quang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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 ((ly hang) or (ly vang)) xa hoi. hieu va cam tuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((ly hang) OR (ly vang)) xa hoi. hieu va cam tuc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu khach ((ly hang) or (ly vang)) xa hoi. hieu va cam tuc va hanh vi cuu tre*.