Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
trang ung » trang vuong, trang phung, trang cong
cong dao » cuong dao, cong dan, cong bao
dong dao » dong dat, dong giao, dong co

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (hieu quang)) - hanh trang ung dung ((cong dao) or (dong dao)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu quang)) - hanh trang ung dung ((cong dao) OR (dong dao)) van ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu quang)) - hanh trang ung dung ((cong dao) or (dong dao)) van ban*.