Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
tang luan » dung luan
tranh cua » doanh cua, manh cua
cong tan » cong tac, cong san, cong ty
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: doi chieu sang - hanh ((tang luan) or (tranh cua)) dang ((cong tan) OR (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh ((tang luan) OR (tranh cua)) dang ((cong tan) OR (cong thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - hanh ((tang luan) or (tranh cua)) dang ((cong tan) OR (cong thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((tang luan) or (tranh cua)) dang ((cong tan) OR (cong thanh)) toan tap*.