Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
va thieu » va hieu, va tieu, van hieu
hanh mai » hanh ma, hanh mau, hanh may
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu vu cham duc ban hanh mai ((va thieu) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu vu cham duc ban hanh mai ((va thieu) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu vu cham duc ban hanh mai ((va thieu) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu vu cham duc ban hanh mai ((va thieu) or (va thiet))*.