Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
te sach » toc sach
ty lang » tay lang, ty hang, tu lang
hieu va » lieu va, hieu qua
duoc va » nuoc va, duc va, duoc ma
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, cua triet
va lam » van lam, va lap
va cua » va chua, via cua, ca cua

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