Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cao quoc » cao thuoc, han quoc, cua quoc
hanh che » han che, hanh nghe, hanh theo
cac quoc » cac nuoc, cac cuoc, han quoc
nang co » nang cao, nang doc, nang noi
hanh he » hanh ve, hanh de, hinh he
co hoi » co hoc, co loi
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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 co hoi. hieu qua ((cao quoc) or (cac quoc)) va ((hanh che) OR (hanh he)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang co hoi. hieu qua ((cao quoc) OR (cac quoc)) va ((hanh che) OR (hanh he)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang co hoi. hieu qua ((cao quoc) or (cac quoc)) va ((hanh che) OR (hanh he)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang co hoi. hieu qua ((cao quoc) or (cac quoc)) va ((hanh che) OR (hanh he)) cua triet*.