Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
ma hoi » mai hoi, xa hoi, me hoi
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: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu vu cham xuc ((va hanh) or (va danh)) tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu vu cham xuc ((va hanh) OR (va danh)) tri va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (ma hoa)). hieu vu cham xuc ((va hanh) or (va danh)) tri va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu vu cham xuc ((va hanh) or (va danh)) tri va thiet*.