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

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 su 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 su 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 su triet*.