Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cao xuc » cam xuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, me hoi
xuc va » duc va, tuc va, luc va
cua te » cua tu
va cao » va cac, va co, va dao

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 va cao xuc va hanh vi ((cua te) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((ma hoi) OR (ma hoa)). hieu va cao xuc va hanh vi ((cua te) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((ma hoi) OR (ma hoa)). hieu va cao xuc va hanh vi ((cua te) or (va triet))*.