Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
hieu van » hieu va, thien van, hieu ve
duc danh » duc anh, duc hanh, duc dan
duc manh » suc manh, duc anh, duc minh
phan dau » phan tu, hang dau
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
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: tu sach y nang x hoi. ((hieu van) OR (lieu va)) cam ((duc danh) OR (duc manh)) thanh phan dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu van) OR (lieu va)) cam ((duc danh) or (duc manh)) thanh phan dau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) OR (lieu va)) cam ((duc danh) or (duc manh)) thanh phan dau tren*.