Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, nhiet nang
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, hieu van
hang cong » dang cong, hang nong, bang cong
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
va hang » van hang, va nang, va lang
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: theo ((chieu sach) or (((hieu lang) OR (nhieu tang)))) - hanh trang va hang cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (((hieu lang) OR (nhieu tang)))) - hanh trang va hang cong dan van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (((hieu lang) OR (nhieu tang)))) - hanh trang va hang cong dan van ban*".