Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu van cau truc ((va thanh) or (ban hanh)) va ((cua tre) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van cau truc ((va thanh) OR (ban hanh)) va ((cua tre) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cau truc ((va thanh) or (ban hanh)) va ((cua tre) or (cua vat))*.