Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
khai duc » khai dich, khai luoc, pham duc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
va khai » van khai, va khao, va kha
mai hoi » mai khoi, dai hoi, lai hoi
xac ky » cac ky, sac ky, bac ky
ma hoi » xa hoi, ma hoa, me hoi
vi cau » va cau, ve cau, di cau
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 va khai duc ((va hanh) OR (va danh)) vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ((ma hoi) OR (mai hoi)). hieu va khai duc ((va hanh) OR (va danh)) vi cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((ma hoi) or (mai hoi)). hieu va khai duc ((va hanh) OR (va danh)) vi cau treo".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((ma hoi) or (mai hoi)). hieu va khai duc ((va hanh) OR (va danh)) vi cau treo*.