Perhaps you should try some spelling variations:
quang trung » truong trung
chieu sang » chieu sach, chieu xanh, hieu lang
quang dung » ung dung, cuong dung
trong hach » trong mach, trong cach, trong hanh
hoc chieu » hoc thieu, ho chieu, hoc hien
toan cau » toan cao, toan tap, toan tai
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 chieu sang - hanh chinh ((quang dung) OR (quang trung)) trong hach ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh chinh ((quang dung) OR (quang trung)) trong hach ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - hanh chinh ((quang dung) OR (quang trung)) trong hach ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh chinh ((quang dung) OR (quang trung)) trong hach ((toan cau) or (toan ban))*.