Perhaps you should try some spelling variations:
kinh dao » minh dao, dinh dao, kinh do
te sach » toc sach
dao cua » dai cua, day cua, dan cua
va kinh » va tinh, qua kinh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
nang ro » nang co, nang ho, nang ra
va lam » van lam, va lap
ro hoi » co hoi, o hoi, mo hoi
te cac » tu cac, ve cac, te cao
va am » 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) OR (va lam)) thuc va kinh dao 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) OR (va lam)) thuc va kinh dao 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) OR (va lam)) thuc va kinh dao cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (te cac)) ky nang ro hoi. hieu ((va am) OR (va lam)) thuc va kinh dao cua tre*.