Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
trung ha » trung hoc, trung tam, trung cap
tap toan » tap quan, bai toan
tap doan » tap quan

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 ((trung ha) or (truong cao)) nhung cong ((tap toan) OR (tap doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh ((trung ha) OR (truong cao)) nhung cong ((tap toan) OR (tap doan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh ((trung ha) or (truong cao)) nhung cong ((tap toan) OR (tap doan)) cao*".