Perhaps you should try some spelling variations:
doanh chua » doanh cua, doanh chung, doanh chuoi
thieu qua » thieu cua, thieu quang, thien quan
doanh chu » doanh chau, doanh thu, doanh cho
bang song » nang song
song dan » song danh, song van, cong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu qua) or (thieu qua)) - chinh ((doanh chua) OR (doanh chu)) bang song dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu qua) OR (thieu qua)) - chinh ((doanh chua) OR (doanh chu)) bang song dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu qua) or (thieu qua)) - chinh ((doanh chua) OR (doanh chu)) bang song dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu qua) or (thieu qua)) - chinh ((doanh chua) OR (doanh chu)) bang song dan toan ban*.