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