Perhaps you should try some spelling variations:
danh thanh » dinh thanh, dang thanh, nhanh thanh
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
duc danh » duc anh, duc manh, duc hanh
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
san cau » van cau, can cau, ran cau
ban cau » bang cau, ban can, van cau
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.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. ((hieu ve) or (hieu van)) cam duc danh thanh ((san cau) OR (ban cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. ((hieu ve) OR (hieu van)) cam duc danh thanh ((san cau) OR (ban cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. ((hieu ve) or (hieu van)) cam duc danh thanh ((san cau) OR (ban cau)) tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. ((hieu ve) or (hieu van)) cam duc danh thanh ((san cau) OR (ban cau)) tren*.