Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
tinh vi » trinh vi, tinh voi, tinh va
luc may » truc may, phuc may
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
cuu tre » cau tren, cau treo
va coc » va cuoc, va cac, va hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((dang xa) OR (dang ha)) hoi. hieu va coc luc may tinh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((dang xa) OR (dang ha)) hoi. hieu va coc luc may tinh vi ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((dang xa) OR (dang ha)) hoi. hieu va coc luc may tinh vi ((cua tre) or (cuu tre))*.