Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hoac khong » hoa khong, hay khong, hoa thong
hanh hang » thanh hang, hang hang, hanh han
hoc khong » hoa khong, hoc hong, khoi khong
doanh bao » doanh ban, doanh bac, doanh cao
doanh bat » danh bat, doanh tai, doanh va
ho chieu » theo chieu, hoc thieu, doi chieu
cong tap » cuong tap, cong tac, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - hanh hang ((hoac khong) or (hoc khong)) cong tap ((doanh bao) OR (doanh bat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh hang ((hoac khong) OR (hoc khong)) cong tap ((doanh bao) OR (doanh bat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh hang ((hoac khong) or (hoc khong)) cong tap ((doanh bao) OR (doanh bat))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh hang ((hoac khong) or (hoc khong)) cong tap ((doanh bao) OR (doanh bat))*.