Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
dung thong » dung thuong, dung trong, dong thong
quan tren » quan trong, quang tran, quan tri
cua dung » cua dang, cua dong, qua dung
tren van » trien van, tran van, tien van

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 sach) or (chiet tach)) - ((hanh tranh) OR (hanh trang)) cua dung thong quan tren van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - ((hanh tranh) OR (hanh trang)) cua dung thong quan tren van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chiet tach)) - ((hanh tranh) OR (hanh trang)) cua dung thong quan tren van".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chiet tach)) - ((hanh tranh) OR (hanh trang)) cua dung thong quan tren van*.