Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lam » thanh lap, hanh lam, thanh nam
lam cua » nam cua, lam chat
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
co hoi » co hoc, co loi
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam
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 ((xuc va) or (luc va)) thanh lam cua 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 ((xuc va) OR (luc va)) thanh lam cua 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 ((xuc va) or (luc va)) thanh lam cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoi) OR (co hoi)). hieu ve cam ((xuc va) or (luc va)) thanh lam cua triet*.