Perhaps you should try some spelling variations:
quang dong » quang dung, quang cuong, quang hoang
hieu xanh » chieu xanh, hieu manh, hieu nganh
quan dong » quan long, quan hoang, quan trong
doc hieu » toc thieu, hoc thieu, hoc hien
hang ban » hang luan, hang va, hang tai
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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 xanh - hang ban ((quan dong) OR (quang dong)) cong dan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hang ban ((quan dong) OR (quang dong)) cong dan van ban*".