Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
hanh mai » hanh ma, hanh mau, hanh may
va thieu » va thiet, va hieu, va tieu
su sach » vu sach
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
duc ban » duc tan, duc van, dua ban
y nang » ky nang, ly nang, v nang

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) OR (so sach)) y nang cao hoi. hieu vu cham duc ban hanh mai va thieu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang cao hoi. hieu vu cham duc ban hanh mai va thieu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang cao hoi. hieu vu cham duc ban hanh mai va thieu*.