Perhaps you should try some spelling variations:
trong cuong » trong chuong, trong cong, trong luong
cuong danh » cuon danh, huong dan, cuong linh
hieu sang » chieu sang, hieu lang, hieu quang
doc hieu » toc thieu, hoc thieu, hoc hien
trung ha » trung hoc, trung cap
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: doc hieu sang - thanh ((trung ha) or (trung tam)) trong cuong danh ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh ((trung ha) OR (trung tam)) trong cuong danh ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - thanh ((trung ha) or (trung tam)) trong cuong danh ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh ((trung ha) or (trung tam)) trong cuong danh ((toan cau) OR (toan ban))*.