Perhaps you should try some spelling variations:
truong quan » trong quan, thong quan, luong quan
cong chung » cong hung, cong thuong, cong cong
chung toan » chung ton, chung than, chung khoan
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
doi hieu » doi chieu, doc hieu, doi hien
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 hieu lang - hanh ((trung cua) or (truong quan)) tong cong chung toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((trung cua) OR (truong quan)) tong cong chung toan cau*.