Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
nhung doanh » nhung danh, dung doanh, nhung don
doanh va » doan va, doanh tai, doanh cua
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
va tong » va thong, va tuong, va trong

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 (trien quang)) - nhung doanh va tong ((cong san) OR (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (trien quang)) - nhung doanh va tong ((cong san) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) or (trien quang)) - nhung doanh va tong ((cong san) OR (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) or (trien quang)) - nhung doanh va tong ((cong san) OR (cong tac)) toan cau*.