Perhaps you should try some spelling variations:
sach luan » sach luyen, sach han
thien van » thi van
san luan » dan luan, tang luan, hang luan
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
vi cua » vai cua, di 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: tu ((sach luan) OR (san luan)) nang xa hoi. ((thien van) OR (hieu va)) cau luc va danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach luan) OR (san luan)) nang xa hoi. ((thien van) or (hieu va)) cau luc va danh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach luan) OR (san luan)) nang xa hoi. ((thien van) or (hieu va)) cau luc va danh vi cua tre*.