Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
su triet » su viet, su tien, ve triet
sach chu » sach che, sach thu, sach thue
chu bang » thu bang, chuc nang, chu quang
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
bang xa » lang xa, bang va, mang xa
tuc va » thuc va, truc va, tuc xa
luc va » duc va, loc va

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 chu bang xa hoi. hieu vu kham ((luc va) OR (tuc va)) doanh van ((cau tren) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach chu bang xa hoi. hieu vu kham ((luc va) OR (tuc va)) doanh van ((cau tren) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach chu bang xa hoi. hieu vu kham ((luc va) OR (tuc va)) doanh van ((cau tren) or (su triet))*.