Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
thanh va » thanh van, hanh va, thanh ha
nang co » nang cao, nang doc, nang noi
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac, te san
co hoi » co hoc, co loi
va cua » va chua, via cua, ca cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (tu cac)) ky nang co hoi. thien van nam ((luc van) OR (duc van)) thanh va cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (tu cac)) ky nang co hoi. thien van nam ((luc van) OR (duc van)) thanh va cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (tu cac)) ky nang co hoi. thien van nam ((luc van) OR (duc van)) thanh va cua triet*.