Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
tu cach » tu cac
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
anh dai » vanh dai, anh bai, anh dat
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky nang xa hoi. ((hieu van) OR (thien van)) nam thuc van anh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang xa hoi. ((hieu van) OR (thien van)) nam thuc van anh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang xa hoi. ((hieu van) OR (thien van)) nam thuc van anh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang xa hoi. ((hieu van) OR (thien van)) nam thuc van anh dai cua tre*.