Perhaps you should try some spelling variations:
danh dau » lanh dao, hang dau, danh tu
danh dai » danh di, danh sai, vanh dai
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
te sac » te sach, te san
nang o » nang co, nang ho, nang ro
te cac » tu cac, ve cac, te cao
o hai » co hai, so hai, o lai
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 o hai. hieu va am thuc va ((danh dai) OR (danh dau)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang o hai. hieu va am thuc va ((danh dai) OR (danh dau)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te cac)) ky nang o hai. hieu va am thuc va ((danh dai) OR (danh dau)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang o hai. hieu va am thuc va ((danh dai) OR (danh dau)) cua tre*.