Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
van hanh » van thanh, ban hanh, van anh
sach thu » sach thieu, sach tham, cach thuc
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
te cua » tue cua, le cua, de cua
o hoi » co hoi, o hoc, o hai

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: su ((sach thu) OR (sach thue)) nang o hoi. hieu ve cac xuc van hanh ((vi cua) OR (te cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) OR (sach thue)) nang o hoi. hieu ve cac xuc van hanh ((vi cua) or (te cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) OR (sach thue)) nang o hoi. hieu ve cac xuc van hanh ((vi cua) or (te cua)) tre*.