Perhaps you should try some spelling variations:
trong van » trong cac
vu khach » vu khanh, vu khac, vay khach
khach ty » sach ty
thanh ki » thanh kim, thanh ky, thanh ke
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc gia » quoc gia
su viet » so viet
ve cam » ve cham, ve cac, va cam
ki su » ky su

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 ty ((trong van) or (mang may)) hoi. hieu ve cam duc gia thanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ty ((trong van) OR (mang may)) hoi. hieu ve cam duc gia thanh ki su viet.
• Adding a wildcard symbol may retrieve word variants: vu khach ty ((trong van) or (mang may)) hoi. hieu ve cam duc gia thanh ki su viet*.