Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thieu » va thiet, va hieu, va tieu
va triet » va thiet, va trien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
so sach » so sanh, bo sach, hoc sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
co sach » bo sach, cuon sach, hoc sach
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam

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

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