Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua viet » ca viet, hoa viet, cua vat
sach han » sach tham, sach danh, sach nang
danh vai » danh sai, danh va, dang van
vu pham » su pham, vi pham, vu kham
sach ha » sach nha, sach xa, bach ha
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ha) OR (sach han)) nang xa hoi. hieu vu pham duc va ((danh vai) or (doanh van)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ha) OR (sach han)) nang xa hoi. hieu vu pham duc va ((danh vai) OR (doanh van)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ha) OR (sach han)) nang xa hoi. hieu vu pham duc va ((danh vai) or (doanh van)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ha) OR (sach han)) nang xa hoi. hieu vu pham duc va ((danh vai) or (doanh van)) cua viet*.