Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ca chua » ca cua, sua chua
va chua » vua chua, va chu, a chua
va hanh » van hanh, va thanh, va danh
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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: ((te sach) OR (toc sach)) ky tang ma hoi. hieu ve cam xuc va hanh ((va chua) OR (ca chua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky tang ma hoi. hieu ve cam xuc va hanh ((va chua) OR (ca chua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky tang ma hoi. hieu ve cam xuc va hanh ((va chua) OR (ca chua)) tre*.