Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thien quan » trien quang, lien quan, thien van
hanh doanh » hang doanh, chinh doanh, doanh doanh
chua bang » chu bang, chua nang, chua xang
cua bang » cua ban, cua dang, cua hang
cong dan » cong san, cong tan, huong 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 quang) or (thien quan)) - hanh doanh ((cua bang) OR (chua bang)) cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (thien quan)) - hanh doanh ((cua bang) OR (chua bang)) cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu quang) or (thien quan)) - hanh doanh ((cua bang) OR (chua bang)) cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quang) or (thien quan)) - hanh doanh ((cua bang) OR (chua bang)) cong dan toan ban*.