Perhaps you should try some spelling variations:
chinh quang » tinh quang, nhanh quang, dinh quang
thieu sang » chieu sang, thieu khang, thieu quang
quang dung » quang trung, ung dung, cuong dung
trong hach » trong mach, trong cach, trong hanh
hoc thieu » toc thieu, hoc hien
toan cau » toan cao, toan tap, toan tai

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

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