Perhaps you should try some spelling variations:
hieu suat » hieu luat, hieu qua
hieu sau » hieu su, tieu su, hieu va
sang lai » sang tai, mang lai, sang mai
sang lap » sang tao, sang ma, sang tai
chat huu » pham huu
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
huu va » cuu va, tuu va
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
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 ky ((sang lai) or (sang lap)) hoa. ((hieu sau) OR (hieu suat)) chat huu va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((sang lai) OR (sang lap)) hoa. ((hieu sau) OR (hieu suat)) chat huu va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((sang lai) or (sang lap)) hoa. ((hieu sau) OR (hieu suat)) chat huu va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((sang lai) or (sang lap)) hoa. ((hieu sau) OR (hieu suat)) chat huu va hanh vi cua te*.