Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trinh viet » ninh viet, trinh vat
phung cong » nhung cong, phong cong, nhung chong
trinh van » trinh han, trinh quan, trinh toan
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan
phan lap » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu quang - hanh ((trinh viet) or (trinh van)) phung cong sat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu quang - hanh ((trinh viet) OR (trinh van)) phung cong sat phan lap*.