Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chinh quan » chinh luan, chinh quyen, trinh quan
hieu lang » chieu sang, nhieu tang, hieu van
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
ban cong » bang cong, van cong, phan cong
toan ban » van ban

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 lang) or (hieu quang)) - hanh ((chinh quan) OR (chinh ngan)) ban cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - hanh ((chinh quan) OR (chinh ngan)) ban cong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - hanh ((chinh quan) OR (chinh ngan)) ban cong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - hanh ((chinh quan) OR (chinh ngan)) ban cong manh toan ban*.