Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh manh » hanh mang, lanh manh, hoang manh
dang cong » dung cong
bang song » nang song
danh toan » manh toan, anh toan, dan toan
doi hieu » doi chieu, doc hieu, doi hien
manh cua » doanh cua, ban cua
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: doi hieu quang - hanh manh cua ((dang cong) or (bang song)) danh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu quang - hanh manh cua ((dang cong) OR (bang song)) danh toan cau*.