Perhaps you should try some spelling variations:
hieu suat » hieu luat, hieu qua
van hanh » van thanh, ban hanh, van anh
kyo sang » cao sang
sang lai » sang tai, sang lap, mang lai
hieu sau » hieu su, tieu su, hieu va
sang kyo » sang ky, sang tao, dang ky
tu sang » thu sang, tu san, tu lang
lai hoi » dai hoi, lai hoa, lai roi
xu van » tu van, vu van, su van
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sang kyo sang lai hoi. ((hieu sau) or (hieu suat)) chao xu van hanh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang kyo sang lai hoi. ((hieu sau) OR (hieu suat)) chao xu van hanh vi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sang kyo sang lai hoi. ((hieu sau) or (hieu suat)) chao xu van hanh vi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sang kyo sang lai hoi. ((hieu sau) or (hieu suat)) chao xu van hanh vi ((cua te) OR (cua tu))*.