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

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) OR (nhanh mang)) 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) OR (nhanh mang)) 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) OR (nhanh mang)) va dung cong quang ((toan cao) or (van ban))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((hanh mang) OR (nhanh mang)) va dung cong quang ((toan cao) or (van ban))*.