Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
ty tang » tay tang, ty hang, ky tang
cho hoc » co hoc, khoa hoc
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty tang) or (ty xang)) cho hoc. hieu ve cac xuc ban hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty tang) OR (ty xang)) cho hoc. hieu ve cac xuc ban hanh vi cua cau*.