Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc danh » duc anh, duc hanh, duc dan
duc manh » suc manh, duc anh, duc minh
hieu ve » hieu va, hieu van
hai cau » hai chau, hai hau, hoi cau
hai chu » hai chau, hoi chu, hai chi
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ve cam ((duc danh) OR (duc manh)) thanh ((hai cau) OR (hai chu)) tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ve cam ((duc danh) or (duc manh)) thanh ((hai cau) OR (hai chu)) tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ve cam ((duc danh) or (duc manh)) thanh ((hai cau) OR (hai chu)) tren*.