Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
cam quoc » cac quoc, cao quoc, nam quoc
hieu va » lieu va
danh di » xanh di, danh dien, danh gia
danh du » danh dau, danh tu, dinh du
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
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 va) or (hieu qua)) cam quoc ban ((danh di) OR (danh du)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. ((hieu va) OR (hieu qua)) cam quoc ban ((danh di) OR (danh du)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o hoi. ((hieu va) or (hieu qua)) cam quoc ban ((danh di) OR (danh du)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. ((hieu va) or (hieu qua)) cam quoc ban ((danh di) OR (danh du)) cua triet*.