Perhaps you should try some spelling variations:
duc manh » suc manh, duc minh, duc tan
hang doi » hang di, hang loi, huong doi
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc phan
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
cua te » cua tu
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: tu sach y nang x hoi. hieu va cam ((duc van) OR (((duc manh) OR (duc anh)))) hang doi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu va cam ((duc van) or (((duc manh) OR (duc anh)))) hang doi cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va cam ((duc van) or (((duc manh) OR (duc anh)))) hang doi cua te*.