Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
duc danh » duc anh, duc hanh, duc dan
duc manh » suc manh, duc anh, duc minh
dau tien » van tien
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hai dau » han dau, hai dan, hai hau
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
o hoc » co hoc, mo hoc, so hoc

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 o hoc. hieu ve cam ((duc danh) OR (duc manh)) thanh hai dau tien~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoc. hieu ve cam ((duc danh) or (duc manh)) thanh hai dau tien*.