Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
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 hoi. hieu va am thuc va ((danh dai) or (lanh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang o hoi. hieu va am thuc va ((danh dai) OR (lanh dao)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang o hoi. hieu va am thuc va ((danh dai) or (lanh dao)) cua tre*.