Perhaps you should try some spelling variations:
pnhung cong » phung cong, nhung bong, nhung cang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
quang cua » quan cua, quang tuan, quang huy
doi hieu » doi chieu, doc hieu, doi hien
tan toan » tan tran, tap toan, van toan
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 - nhanh quang cua ((nhung cong) or (pnhung cong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - nhanh quang cua ((nhung cong) OR (pnhung cong)) tan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - nhanh quang cua ((nhung cong) or (pnhung cong)) tan toan cau*.