Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
so viet » hoc viet
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
vi so » vi soi, vi mo, va so

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

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