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

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 ((y tang) or (6 tang)) ma hoi. hieu va cac cuc ban thanh ve ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (6 tang)) ma hoi. hieu va cac cuc ban thanh ve ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (6 tang)) ma hoi. hieu va cac cuc ban thanh ve ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (6 tang)) ma hoi. hieu va cac cuc ban thanh ve ((va triet) OR (va trien))*.