Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
hoc sach » hoc sinh, hoc cac, hoc anh
dat hang » dat khanh, dat quang, tat thang
phat xuc » chat xuc, phat xuat, phap xu
van danh » van doanh, van anh, van hanh
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
di cua » doi cua, de cua, do cua

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: ((doc sach) OR (hoc sach)) dat hang xa hoi. hieu va phat xuc van danh ((di cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (hoc sach)) dat hang xa hoi. hieu va phat xuc van danh ((di cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (hoc sach)) dat hang xa hoi. hieu va phat xuc van danh ((di cua) or (dai cua)) tre*.