Perhaps you should try some spelling variations:
hieu suat » hieu luat, hieu qua
suat chao » suat cao, suat chat, xuat chao
phu san » phi san, thuy san
lai roi » loi roi
lai hoi » dai hoi, lai hoa, mai hoi
ky sang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
cua te » cua tu
su va » su van

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

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