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 mach » trong cac, trong minh, trong anh
hoc thieu » toc thieu, hoc hien
toan cau » toan tap, toan tai
toan cao » toan tap
toan ban » van ban

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