Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va doanh » van doanh, vay doanh, hoa doanh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, va cam
ca te » cua te, ca ve, ca me

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: toc sach ky nang ((ma hoi) OR (ma hoa)). hieu ve cam duc ((va doanh) OR (va danh)) dan ca te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((ma hoi) or (ma hoa)). hieu ve cam duc ((va doanh) OR (va danh)) dan ca te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((ma hoi) or (ma hoa)). hieu ve cam duc ((va doanh) OR (va danh)) dan ca te*.