Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
ve dam » ven dam, ke dam, va dam
dam tu » nam tu, cam tu, tam tu
vi va » vi van, vai va, vu va
thiet » thieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((ma hoa) OR (mai hoi)). hieu ve dam tu ((va hanh) OR (va danh)) vi va thiet~.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((ma hoa) or (mai hoi)). hieu ve dam tu ((va hanh) or (va danh)) vi va thiet*.