Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua thong » cua thuong, cua khong, cua tong
tinh cua » trinh cua, sinh cua, tinh chat
cong dan » cong san, cong tan, huong dan
chan ban » can ban, chat ban, chan doan
chan nan » chan nhan, chang nang, chan doan

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 tinh cua thong cong dan ((chan ban) OR (chan nan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - hanh tinh cua thong cong dan ((chan ban) OR (chan nan))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh tinh cua thong cong dan ((chan ban) OR (chan nan))*.