Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
truc ban » thuc ban, truc dan, truc van
va thieu » va thiet, va hieu, va tieu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
co sach » bo sach, cuon sach
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (co sach)) v nang ma hoi. hieu ve cau truc ban thanh ve ((va triet) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (co sach)) v nang ma hoi. hieu ve cau truc ban thanh ve ((va triet) OR (va thieu)).
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (co sach)) v nang ma hoi. hieu ve cau truc ban thanh ve ((va triet) or (va thieu))*.