Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh ban » trinh ban, tranh hang, tranh luan
dung cong » dung trong
van phong » van dong, hai phong
doc hieu » toc thieu, hoc thieu, hoc hien
tran van » luan van
phong tu » phong tuc, thong tu, phong thuy

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 xanh - canh ((tranh ban) or (tran van)) ((nhung cong) OR (dung cong)) van phong tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh ((tranh ban) OR (tran van)) ((nhung cong) OR (dung cong)) van phong tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh ((tranh ban) or (tran van)) ((nhung cong) OR (dung cong)) van phong tu".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh ((tranh ban) or (tran van)) ((nhung cong) OR (dung cong)) van phong tu*.