Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hien quang » dien quang, bien quang, hien quan
trung cap » truong cao, trung tam
dung cua » dung luan, dung cho
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien quang - thanh ((dung cua) or (trung cap)) thuong cong dan ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien quang - thanh ((dung cua) OR (trung cap)) thuong cong dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien quang - thanh ((dung cua) or (trung cap)) thuong cong dan ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc hien quang - thanh ((dung cua) or (trung cap)) thuong cong dan ((toan cau) OR (toan cao))*.