Perhaps you should try some spelling variations:
ho chiet » ho chieu, hoc thiet, hoa thiet
ho thiet » hoc thiet, hoa thiet, so thiet
cua dang » cua cong, cua ban
qua dung » quang dung, su dung, qua song
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chiet) or (ho thiet)) tach - canh tranh ((cua dang) or (qua dung)) cong sat phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (ho thiet)) tach - canh tranh ((cua dang) OR (qua dung)) cong sat phan dau.
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) or (ho thiet)) tach - canh tranh ((cua dang) or (qua dung)) cong sat phan dau*.