Perhaps you should try some spelling variations:
hieu sang » chieu sang, hieu lang, hieu quang
dung cong » dung trong
cong danh » cuong danh, cong dan, cong thanh
danh toan » manh toan, anh toan, dan toan
doc hieu » toc thieu, hoc thieu, hoc hien
cung vap » cung va, cung van, dung va
cung cap » trung cap
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 - manh ((cung vap) or (cung cap)) dung cong danh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - manh ((cung vap) OR (cung cap)) dung cong danh toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - manh ((cung vap) or (cung cap)) dung cong danh toan ban*.