Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chiet tach » chieu sach
dang cong » dung cong
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cua dang » cua cong, cua ban
cong tan » cong tac, cong san, cong thanh

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 quang) or (chiet tach)) - anh tang cua dang cong tan ((toan ban) OR (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chiet tach)) - anh tang cua dang cong tan ((toan ban) OR (van ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) or (chiet tach)) - anh tang cua dang cong tan ((toan ban) OR (van ban))*".