Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
dang cong » dung cong
bang song » nang song
danh toan » manh toan, anh toan, dang toan
doi hieu » doi chieu, doc hieu, doi hien
manh cua » doanh cua, ban cua
dan toan » van toan, dan than, manh toan

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 lang - hanh manh cua ((dang cong) or (bang song)) ((danh toan) OR (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh manh cua ((dang cong) OR (bang song)) ((danh toan) OR (dan toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh manh cua ((dang cong) or (bang song)) ((danh toan) OR (dan toan)) cau*".