Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
bo sach » co sach, hoc sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
vi su » ve su, ki su, oi su

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

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