Perhaps you should try some spelling variations:
trong quang » truong quang, thong quang, trong quan
luong quang » luong quan, dung quang
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
doi chiet » doi chieu, doi chi, doi viet
cong san » cong tac
san khan » san khau, san khac, san phan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh ((trong quang) or (luong quang)) thong cong san khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh ((trong quang) OR (luong quang)) thong cong san khan cap.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh ((trong quang) or (luong quang)) thong cong san khan cap*.