Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
hai duc » hoai duc, mai duc, ha duc
qua hai » qua hoat
mai hoi » mai khoi, dai hoi, lai hoi
xac ky » cac ky, sac ky, bac ky
ma hoi » xa hoi, ma hoa, me hoi
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang ((ma hoi) or (mai hoi)). hieu qua hai duc va hanh ve ((cau treo) OR (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ((ma hoi) OR (mai hoi)). hieu qua hai duc va hanh ve ((cau treo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((ma hoi) or (mai hoi)). hieu qua hai duc va hanh ve ((cau treo) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((ma hoi) or (mai hoi)). hieu qua hai duc va hanh ve ((cau treo) OR (cau triet))*.