Perhaps you should try some spelling variations:
xa truong » cac truong
hieu van » hieu va, thien van, lieu va
va huong » va thuong, va phuong, va tuong
bo sach » hoc sach
co sach » cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
nam tuc » nam thuc, nam truc, nam tu
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: ((bo sach) OR (co sach)) ky nang xa hoi. hieu van nam tuc ((va huong) or (xa truong)) hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (co sach)) ky nang xa hoi. hieu van nam tuc ((va huong) OR (xa truong)) hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) OR (co sach)) ky nang xa hoi. hieu van nam tuc ((va huong) or (xa truong)) hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) OR (co sach)) ky nang xa hoi. hieu van nam tuc ((va huong) or (xa truong)) hoi cua tre*.