Perhaps you should try some spelling variations:
te sach » toc sach
nang ro » nang co, nang ho, nang ra
hieu va » lieu va, hieu qua
va dinh » van dinh, va tinh, vu dinh
va kinh » va tinh, qua kinh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
ro hoi » co hoi, o hoi, mo hoi
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 sach) or (te cac)) ky nang ro hoi. hieu va am thuc ((va dinh) OR (va kinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (te cac)) ky nang ro hoi. hieu va am thuc ((va dinh) OR (va kinh)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (te cac)) ky nang ro hoi. hieu va am thuc ((va dinh) OR (va kinh)) dai cua tre*".