Perhaps you should try some spelling variations:
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
hanh ca » hanh cac, hanh cat, hanh cua
hang do » hang doi, dang do, hang di
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
ca cua » co cua
ve cam » ve cham, ve cac, va cam
va cao » va cac, va co, va dao
hang o » hang o2, hoang o, thang o
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((hang o) OR (hang do)) hoi. hieu ((ve cam) or (va cao)) duc ban hanh ca cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((hang o) OR (hang do)) hoi. hieu ((ve cam) OR (va cao)) duc ban hanh ca cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((hang o) OR (hang do)) hoi. hieu ((ve cam) or (va cao)) duc ban hanh ca cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((hang o) OR (hang do)) hoi. hieu ((ve cam) or (va cao)) duc ban hanh ca cua tu*.