Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
nam tuc » nam thuc, nam truc, nam tu
va tinh » may tinh
cua te » cua tu

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 thu nang xa hoi. hieu van nam tuc ((va tinh) or (ban thanh)) hai ((cua te) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang xa hoi. hieu van nam tuc ((va tinh) OR (ban thanh)) hai ((cua te) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. hieu van nam tuc ((va tinh) or (ban thanh)) hai ((cua te) or (cau treo))*.