Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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