Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhung cong » dung cong, hang cong, nhung don
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, ban cua
toan cao » toan tap
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 xanh - cach mang cua ((nhung cong) or (thong cong)) tac ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - cach mang cua ((nhung cong) OR (thong cong)) tac ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - cach mang cua ((nhung cong) or (thong cong)) tac ((toan cao) or (toan ban))*.