Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ky sang » ky nang, ky dang, duy sang
vai cau » va cau, van cau, vai cac
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: thu sach ((ky sang) OR (ky tang)) mai hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vai cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) or (ky tang)) mai hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vai cau tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky tang)) mai hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vai cau tren*.