Perhaps you should try some spelling variations:
hieu sang » chieu sang, hieu lang, hieu quang
tran tuan » tran quang, tran thanh, tranh luan
tran xuan » tran quang, tran van
dung cong » dung trong
cong danh » cuong danh, cong dan, cong thanh
doc hieu » toc thieu, hoc thieu, hoc hien
tuan cau » toan cau, quan cau, tuan cu
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 ((tran tuan) OR (tran xuan)) dung cong danh ((tuan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh ((tran tuan) OR (tran xuan)) dung cong danh ((tuan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - thanh ((tran tuan) OR (tran xuan)) dung cong danh ((tuan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh ((tran tuan) OR (tran xuan)) dung cong danh ((tuan cau) or (toan ban))*.