Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
te sach » toc sach
van cua » vang cua, ban cua, dan cua
va nang » van nang, da nang, cam nang
va lang » hoa lang
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ty lang » tay lang, ty hang, tu lang
va lam » van lam, va lap

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 lang) OR (va nang)) van 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 lang) OR (va nang)) van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty lang) or (ty xang)) xa hoi. hieu va lam duoc ((va lang) OR (va nang)) van cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (ty xang)) xa hoi. hieu va lam duoc ((va lang) OR (va nang)) van cua tre*.