Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
hieu va » lieu va
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac
te san » te ban, ke san, tu san
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky nang x hoi. ((hieu va) OR (hieu qua)) am thuc va danh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te san)) ky nang x hoi. ((hieu va) OR (hieu qua)) am thuc va danh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te san)) ky nang x hoi. ((hieu va) OR (hieu qua)) am thuc va danh dai cua tre*.