Perhaps you should try some spelling variations:
quang cong » quang cuong, quang dong, quang hoang
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
hanh manh » hanh mang, lanh manh, hoang manh
van thanh » ban thanh, van tuan
chu quang » chat quang, vu quang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - ((hanh manh) or (van thanh)) chu quang cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh manh) OR (van thanh)) chu quang cong dan than ban.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh manh) or (van thanh)) chu quang cong dan than ban*.