Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
gian cua » gian xu, ban cua
hieu van » hieu va, thien van, lieu va
va nang » van nang, da nang, cam nang
va hang » van hang, va lang, va hanh
te sach » toc sach
van lam » van nam
tu lang » cu lang, tu lanh, xu lang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((tu lang) or (ty xang)) xa hoi. hieu van lam duoc ((va hang) or (va nang)) gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu lang) OR (ty xang)) xa hoi. hieu van lam duoc ((va hang) OR (va nang)) gian cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu lang) or (ty xang)) xa hoi. hieu van lam duoc ((va hang) or (va nang)) gian cua tre*.