Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
chat duc » chat xuc, chat doc, chet duoc
hanh dai » hanh tai, hanh dao, vanh dai
ky tang » ky dang, kho tang, ky trong
lai hoi » dai hoi, lai hoa, lai roi
hieu su » tieu su, hieu so, hieu suat
va hanh » van hanh, va thanh, va danh
cua te » cua 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 cac ((ky tang) OR (ky nang)) lai hoi. ((hieu su) or (hieu sau)) chat duc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky tang) OR (ky nang)) lai hoi. ((hieu su) OR (hieu sau)) chat duc va hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((ky tang) OR (ky nang)) lai hoi. ((hieu su) or (hieu sau)) chat duc va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky tang) OR (ky nang)) lai hoi. ((hieu su) or (hieu sau)) chat duc va hanh dai cua te*.