Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
vu sach » vu bach, su sach, vu khach
co hoi » co hoc, co loi
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va
loc va » hoc va
lam va » nam va, dam va, lam ha
o hoi » o hoc, 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: vu sach ky nang ((o hoi) or (co hoi)). hieu ve cam ((luc va) OR (loc va)) thanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hoi) OR (co hoi)). hieu ve cam ((luc va) OR (loc va)) thanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((o hoi) or (co hoi)). hieu ve cam ((luc va) OR (loc va)) thanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoi) or (co hoi)). hieu ve cam ((luc va) OR (loc va)) thanh lam va triet*.