Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh ve, nhanh vi
thanh va » thanh van, hanh va, thanh ha
nam duc » nam duoc, pham duc, nam thuc
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
co hoi » co loi

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

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