Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
dinh tri » chinh tri
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
thuc va » thuc vat, thuc dan, thuc day
dinh vi » dinh ve, dinh viet, dinh thi
cua tre » cua te, cuu tre, cua triet
te bac » ten bac, te bao, te ban
bac ky » cac ky, ban ky, sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te bac ky tang xa hoi. hieu van nam thuc va ((dinh vi) or (dinh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bac ky tang xa hoi. hieu van nam thuc va ((dinh vi) OR (dinh tri)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te bac ky tang xa hoi. hieu van nam thuc va ((dinh vi) or (dinh tri)) cua tre*.