Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
dap luong » dai luong, do luong, van luong
da luong » dai luong, do luong, du luong
cong san » cong tac
toan tap » toan ban
toan cao » 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 - thanh tung ((dap luong) OR (da luong)) cong san ((toan tap) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tung ((dap luong) OR (da luong)) cong san ((toan tap) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh tung ((dap luong) OR (da luong)) cong san ((toan tap) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tung ((dap luong) OR (da luong)) cong san ((toan tap) or (toan cao))*.