Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
tu xang » ty xang, tu lang, tu quang
cho 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
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: ((te sach) OR (toc sach)) tu xang ((cho hoc) or (co hoc)). hieu ve cac xuc ban hanh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu xang ((cho hoc) OR (co hoc)). hieu ve cac xuc ban hanh vi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu xang ((cho hoc) or (co hoc)). hieu ve cac xuc ban hanh vi cua cac*".