Perhaps you should try some spelling variations:
truong quan » trong quan, thong quan, luong quan
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
cong tan » cong tac, cong san, cong thanh
than cau » phan cau, than cap, thanh chau
toan cau » 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 - thanh ((trung cua) or (truong quan)) thong cong tan ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh ((trung cua) OR (truong quan)) thong cong tan ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh ((trung cua) or (truong quan)) thong cong tan ((than cau) or (toan cau))*.