Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
bang cong » dang cong, bang song, hang cong
tinh cua » trinh cua, sinh cua, tinh chat
cua bang » chua bang, cua ban, cua dang
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
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: ho ((hieu quang) OR (hieu qua)) - nhanh tinh cua bang cong dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (hieu qua)) - nhanh tinh cua bang cong dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) OR (hieu qua)) - nhanh tinh cua bang cong dan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) OR (hieu qua)) - nhanh tinh cua bang cong dan ((toan cau) or (toan cao))*.