Perhaps you should try some spelling variations:
sach thuy » sach thu, sach thue, sach tham
trong xa » trong xay, trong ca, trong ba
van hanh » van thanh, ban hanh, van anh
trong xu » thong xu, trong su, trong thu
cam luc » cam xuc, cau luc
cuu tre » cau tren, cau treo
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cua triet, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thuy ((trong xa) or (trong xu)) hoi. hieu qua cam luc van hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thuy ((trong xa) OR (trong xu)) hoi. hieu qua cam luc van hanh vi ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach thuy ((trong xa) or (trong xu)) hoi. hieu qua cam luc van hanh vi ((cuu tre) or (cua tre))*.