Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trang » thanh trung, hanh trinh, minh trang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
toan ban » van ban

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 sang - ((hanh trang) OR (canh tranh)) qua dung cong dan ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh trang) OR (canh tranh)) qua dung cong dan ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh trang) OR (canh tranh)) qua dung cong dan ((toan tap) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh trang) OR (canh tranh)) qua dung cong dan ((toan tap) or (toan ban))*.