Perhaps you should try some spelling variations:
thuc tuan » thu tuan, thuc huan, thuc luan
hieu van » thien van, lieu va, hieu ve
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
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
anh va » hanh va
va cua » va chua, via cua, ca cua

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