Perhaps you should try some spelling variations:
truong quan » trong quan, thong quan, luong quan
thuong cong » thong cong, thuong con, thuong dong
chieu sang » chieu sach, chieu xanh, hieu lang
truong cua » truong ca, truong cao, huong cua
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - thanh ((truong cua) OR (truong quan)) thuong cong tan phan tu~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh ((truong cua) OR (truong quan)) thuong cong tan phan tu*.