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

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 duc 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 duc va doanh van ((cau tren) or (su triet))*.