Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hinh hanh » hinh thanh, hinh anh, dinh thanh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
tran cao » toan cao, tran chau, trang cho
hanh va » hang va, hanh vi

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 - hinh hanh va ((hang cong) or (dang cong)) tan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hinh hanh va ((hang cong) OR (dang cong)) tan tran cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hinh hanh va ((hang cong) or (dang cong)) tan tran cao*.