Perhaps you should try some spelling variations:
thuc tuan » thu tuan, thuc huan, thuc luan
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
tu cach » tu cac
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
anh vai » anh bai, anh van, anh tai
cua tre » cua te, cuu tre, cua triet
anh va » hanh va

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 nam thuc tuan ((anh vai) OR (anh va)) 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 nam thuc tuan ((anh vai) OR (anh va)) 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 nam thuc tuan ((anh vai) OR (anh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang xa hoi. hieu van nam thuc tuan ((anh vai) OR (anh va)) cua tre*.