Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » hanh chinh
hoi chieu » doi chieu, ho chieu, hai chieu
cua thong » cua thuong, cua khong, cua tong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi chieu sang - ((hanh trinh) or (canh tranh)) cua thong ((cong dan) OR (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi chieu sang - ((hanh trinh) OR (canh tranh)) cua thong ((cong dan) OR (cong san)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi chieu sang - ((hanh trinh) or (canh tranh)) cua thong ((cong dan) OR (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoi chieu sang - ((hanh trinh) or (canh tranh)) cua thong ((cong dan) OR (cong san)) toan tap*.