Perhaps you should try some spelling variations:
truong quan » trong quan, luong quan, truong van
truong cong » trong cong, truong dong, truong long
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
cong san » cong tac
khoan va » doan va, khoa ma, toan va
nhan va » nhan tai, nhan dan, nhan tao

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