Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
cuc ban » cua ban, cac ban, cuu ban
cac cuc » cac cuoc, cac cua, cac nuoc
hieu va » lieu va, hieu qua
te sach » toc sach
ma hoi » mai hoi, xa hoi, me hoi
5 tang » 7 tang
ve va » ve van, te va, ke va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((5 tang) or (6 tang)) ((ma hoi) or (ma hoa)). hieu va cac cuc ban thanh ve va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((5 tang) OR (6 tang)) ((ma hoi) OR (ma hoa)). hieu va cac cuc ban thanh ve va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ((5 tang) or (6 tang)) ((ma hoi) or (ma hoa)). hieu va cac cuc ban thanh ve va triet*.