Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
dong huong » dong thuong, dong duong, cong huong
hieu sang » chieu sang, hieu lang, nhieu tang
hang ban » hang luan, hang va, hang tai
cua dong » chua dong, cua cong, cua dang
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) or (hieu quang)) - hang ban cua dong huong ((dan than) OR (van than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu quang)) - hang ban cua dong huong ((dan than) OR (van than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (hieu quang)) - hang ban cua dong huong ((dan than) OR (van than)) ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - hang ban cua dong huong ((dan than) OR (van than)) ban*.