Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » thong cong, hang cong, nhung don
hoc thieu » toc thieu, hoc hien
tranh van » tran van, trinh van, thanh van
dung cong » dung trong
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: hoc thieu xanh - canh tranh van ((nhung cong) or (dung cong)) tap ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh van ((nhung cong) OR (dung cong)) tap ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh van ((nhung cong) or (dung cong)) tap ((toan cao) or (toan ban))*.