Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
duc danh » duc anh, duc hanh, duc dan
duc manh » suc manh, duc anh, duc minh
cau tren » cu tren, dau tren, ca tren
hai cau » hai chau, hai chu, hai hau
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
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) OR (ve cac)) ((duc danh) OR (duc manh)) thanh hai cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) ((duc danh) or (duc manh)) thanh hai cau tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) ((duc danh) or (duc manh)) thanh hai cau tren*.