Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so hoc

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 (ve cac)) ky nang o hoc. ((lieu va) or (hieu qua)) am thuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (ve cac)) ky nang o hoc. ((lieu va) OR (hieu qua)) am thuc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (ve cac)) ky nang o hoc. ((lieu va) or (hieu qua)) am thuc va hanh dai cua tre*.