Perhaps you should try some spelling variations:
cac thiet » cach thiet, cad thiet, cam thiet
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
cham xuc » cam xuc, chat xuc, cham soc
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
vi cac » voi cac, vai cac, va cac

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: tu sach ky dang ma hoi. ((hieu ve) OR (hieu va)) cham xuc ((ban hanh) OR (van hanh)) vi cac thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ma hoi. ((hieu ve) OR (hieu va)) cham xuc ((ban hanh) or (van hanh)) vi cac thiet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ma hoi. ((hieu ve) OR (hieu va)) cham xuc ((ban hanh) or (van hanh)) vi cac thiet*.