Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh sai, doanh van, dang van
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
danh va » doanh va, hanh va, anh va
hieu ve » hieu va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang o hoi. ((hieu ve) OR (hieu van)) am thuc va ((danh vai) or (danh va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. ((hieu ve) OR (hieu van)) am thuc va ((danh vai) OR (danh va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o hoi. ((hieu ve) OR (hieu van)) am thuc va ((danh vai) or (danh va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. ((hieu ve) OR (hieu van)) am thuc va ((danh vai) or (danh va)) cua triet*.