Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
te sang » te bang, te hang, te san
sang ky » sang kyo, dang ky, tang ky
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
luc van » luoc van, duc van, luc va
luu van » cuu van, luan van, luu hanh
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: te sang ky nang ((cao hoi) or (cao hoc)). thien van nam ((luc van) OR (luu van)) thanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sang ky nang ((cao hoi) OR (cao hoc)). thien van nam ((luc van) OR (luu van)) thanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sang ky nang ((cao hoi) or (cao hoc)). thien van nam ((luc van) OR (luu van)) thanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: te sang ky nang ((cao hoi) or (cao hoc)). thien van nam ((luc van) OR (luu van)) thanh vi cua triet*.