Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
va hanh » van hanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
cam tu » cam thu, nam tu, dam tu
thiet » thieu

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 y nang ma hoi. hieu van cam tu ((va hanh) or (va thanh)) vi ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu van cam tu ((va hanh) OR (va thanh)) vi ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu van cam tu ((va hanh) or (va thanh)) vi ((va triet) or (va thiet))*.