Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
dien quang » diep quang, trien quang, lien quan
hanh doanh » hang doanh, chinh doanh, doanh doanh
cua thong » cua thuong, cua khong, suat thong
cua tong » cua cong, cua dong, cua nong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu quang) or (dien quang)) - hanh doanh ((cua thong) OR (cua tong)) cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (dien quang)) - hanh doanh ((cua thong) OR (cua tong)) cong tap toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) or (dien quang)) - hanh doanh ((cua thong) OR (cua tong)) cong tap toan cau*".