Perhaps you should try some spelling variations:
danh dau » lanh dao, hang dau, danh tu
hieu va » lieu va
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
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. ((hieu va) or (hieu qua)) am thuc va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (ve cac)) ky nang o hoc. ((hieu va) OR (hieu qua)) am thuc va danh dau cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (ve cac)) ky nang o hoc. ((hieu va) or (hieu qua)) am thuc va danh dau cua tre*.