Perhaps you should try some spelling variations:
cua triet » su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hanh hai » thanh hai, nhanh hai, hang hai
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 y nang ma hoi. ((hieu va) OR (hieu qua)) cam duc va hanh hai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. ((hieu va) OR (hieu qua)) cam duc va hanh hai ((cua triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. ((hieu va) OR (hieu qua)) cam duc va hanh hai ((cua triet) or (cua viet))*.