Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac xuc » cac nuoc, chat xuc, cac cuoc
cuc tre » duc tre, cua tre, cuu tre
ma hoi » mai hoi, xa hoi, ma hoa

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) va doanh tai cuc tre~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ma hoi. hieu va ((cac xuc) OR (cam xuc)) va doanh tai cuc tre*.