Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, x ho
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (te cac)) ky nang x hoi. hieu va am thuc ((va danh) OR (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang x hoi. hieu va am thuc ((va danh) OR (va dan)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te cac)) ky nang x hoi. hieu va am thuc ((va danh) OR (va dan)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang x hoi. hieu va am thuc ((va danh) OR (va dan)) dai cua tre*.