Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
chat xuc » chat huu, cam xuc, chao xu
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, cac cuoc
va hanh » van hanh, va thanh, va danh
co hoi » co hoc
vi cau » va cau, ve cau, di cau

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: thuoc sach ky nang ((co hoi) OR (co loi)). hieu ve ((cac xuc) OR (chat xuc)) va hanh vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((co hoi) OR (co loi)). hieu ve ((cac xuc) or (chat xuc)) va hanh vi cau tren~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((co hoi) OR (co loi)). hieu ve ((cac xuc) or (chat xuc)) va hanh vi cau tren*.