Perhaps you should try some spelling variations:
khoa sang » khoa dang, khoai lang, kho tang
hieu suat » hieu luat, hieu qua
san khoa » toan khoa, hang khoa, da khoa
sang lai » sang tai, sang lap, mang lai
hieu sau » hieu su, tieu su, hieu va
van hanh » van thanh, ban hanh, van anh
lai hoi » dai hoi, lai hoa, lai roi
tu san » thu san, tu ban, tu can
xu van » tu van, vu van, su van
vi cua » vai cua, di cua
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 san khoa sang lai hoi. ((hieu sau) or (hieu suat)) chao xu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san khoa sang lai hoi. ((hieu sau) OR (hieu suat)) chao xu van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu san khoa sang lai hoi. ((hieu sau) or (hieu suat)) chao xu van hanh vi cua te*.