Perhaps you should try some spelling variations:
cong quang » luong quang, thong quang, duong quang
chieu sang » chieu sach, chieu xanh, hieu lang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
toan cao » toan ban, toan tap
mang va » mang vua, hang va, dang va
bang va » hang va, ban va, trang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh ((mang va) OR (bang va)) dung cong quang ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh ((mang va) OR (bang va)) dung cong quang ((toan cao) OR (van ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - hanh ((mang va) OR (bang va)) dung cong quang ((toan cao) or (van ban))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh ((mang va) OR (bang va)) dung cong quang ((toan cao) or (van ban))*.