Perhaps you should try some spelling variations:
sach tham » sach nha
hoc viet » hoc hien
sach thu » sach thue, sach thieu, cach thuc
van anh » van thanh, tuan anh, van minh
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi
anh vi » hanh vi, anh va, anh ve
vi hoc » li hoc, 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: tu ((sach thu) OR (sach tham)) bang ((ma hoi) OR (ma hoa)). hieu va cac xuc van anh vi hoc viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach tham)) bang ((ma hoi) OR (ma hoa)). hieu va cac xuc van anh vi hoc viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach tham)) bang ((ma hoi) OR (ma hoa)). hieu va cac xuc van anh vi hoc viet*.