Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
duc manh » suc manh, duc anh, duc minh
duc hanh » duc thanh, duc anh, du hanh
tu sach » thu sach, su sach, te sach
phan ca » phan cac, phan cau, phan cam
ca tren » cau tren, cu tren, la tren
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam
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) OR (v nang)) x hoi. hieu ve cam ((duc hanh) OR (duc manh)) thanh phan ca tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) x hoi. hieu ve cam ((duc hanh) or (duc manh)) thanh phan ca tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) x hoi. hieu ve cam ((duc hanh) or (duc manh)) thanh phan ca tren*.