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