Perhaps you should try some spelling variations:
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
bang so » bang son, bang mo, bang su
hanh va » hang va, hanh vi
duc ban » duc tan, duc van, dua ban
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, va cam
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: su sach thu ((bang so) or (dang su)) hai. hieu ((ve cam) or (va cac)) duc ban hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((bang so) OR (dang su)) hai. hieu ((ve cam) OR (va cac)) duc ban hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: su sach thu ((bang so) or (dang su)) hai. hieu ((ve cam) or (va cac)) duc ban hanh va cua te*.