Perhaps you should try some spelling variations:
sach thuy » sach thu, sach thue, sach tham
trong xa » trong xay, trong ca, trong ba
trong xu » thong xu, trong su, trong thu
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
qua ca » qua cac, qua cua, qua cai
ca luc » cau luc, ca lua
luc va » duc va, tuc va, loc va

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 ca luc va 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 ca luc va 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 ca luc va hanh vi ((cuu tre) or (cua tre))*.