Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
sach ty » sach tu, sach thu, xach tay
va nang » van nang, da nang, cam nang
va hang » van hang, va lang, va hanh
van lam » van nam
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
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) OR (sach y)) lang xa hoi. hieu van lam duoc ((va hang) or (va nang)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) lang xa hoi. hieu van lam duoc ((va hang) OR (va nang)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) lang xa hoi. hieu van lam duoc ((va hang) or (va nang)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) lang xa hoi. hieu van lam duoc ((va hang) or (va nang)) va cua tre*.