Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
tac thong » tac thuong, tac trong, tac chong
doi hieu » doi chieu, doc hieu, doi hien
cong tac » cong ty
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan

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 - thanh cong tac thong cong sat phan tu~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh cong tac thong cong sat phan tu*.