Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh van » thanh san, thanh toan, thanh nhan
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
ty lang » tay lang, ty hang, tu lang
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
duc gia » quoc gia
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty lang) OR (ty xang)) xa hoi. hieu van cao duc gia ((thanh van) OR (thanh phan)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) or (ty xang)) xa hoi. hieu van cao duc gia ((thanh van) OR (thanh phan)) cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) or (ty xang)) xa hoi. hieu van cao duc gia ((thanh van) OR (thanh phan)) cua te*.