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
va duong » van duong, va huong, va dong
va tuong » va thuong, va thong, xa truong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hoi cua » hoi chuc
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: so sach ky nang xa hoi. ((hieu van) or (thien van)) nam thuc ((va duong) OR (va tuong)) hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. ((hieu van) OR (thien van)) nam thuc ((va duong) OR (va tuong)) hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. ((hieu van) or (thien van)) nam thuc ((va duong) OR (va tuong)) hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. ((hieu van) or (thien van)) nam thuc ((va duong) OR (va tuong)) hoi cua tre*.