Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
thanh lam » thanh lap, hanh lam, thanh nam
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
lam chat » luan chat, cao chat, ly chat
sach ky » sac ky, sach y, sach ty
van hau » van ha, van hai, van dau
hau duc » huu duc, ha duc, pham duc
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
co hai » co dai, co hoi, o hai
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((((o hoi) or (o hoc))) or (co hai)). hieu van hau duc van thanh lam chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((o hoi) OR (o hoc))) OR (co hai)). hieu van hau duc van thanh lam chat triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((o hoi) or (o hoc))) or (co hai)). hieu van hau duc van thanh lam chat triet*.