Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
dai hoi » dai hoc, dai hai, dai moi
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ha duc » ho duc, ha dac, xa duc
ve cau » ke cau, va cau, ve 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 ((xa hoi) or (dai hoi)). ((hieu va) or (hieu qua)) ha duc va hanh ve cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ((xa hoi) OR (dai hoi)). ((hieu va) OR (hieu qua)) ha duc va hanh ve cau treo.
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((xa hoi) or (dai hoi)). ((hieu va) or (hieu qua)) ha duc va hanh ve cau treo*.