Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
ty nang » ky nang, ty xang, ty hang
van cac » van hac, van cau, van bac
vi cua » vai cua, di cua

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 ty nang ((cao hoi) OR (cao hoc)). hieu van cac xuc ((va hanh) or (ban hang)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((cao hoi) OR (cao hoc)). hieu van cac xuc ((va hanh) OR (ban hang)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((cao hoi) OR (cao hoc)). hieu van cac xuc ((va hanh) or (ban hang)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((cao hoi) OR (cao hoc)). hieu van cac xuc ((va hanh) or (ban hang)) vi cua triet*.