Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
cong anh » cong danh, dong anh, hong anh
anh quan » anh tuan, ban quan, anh nhan
quan tai » quan tri, quang tri, quan li

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 (chiet tach)) - ((anh tang) OR (anh dang)) tin dung cong anh quan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chiet tach)) - ((anh tang) OR (anh dang)) tin dung cong anh quan tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chiet tach)) - ((anh tang) OR (anh dang)) tin dung cong anh quan tai".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chiet tach)) - ((anh tang) OR (anh dang)) tin dung cong anh quan tai*.