Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh dinh » thanh dinh, hinh dinh, hanh tinh
cuu thong » cuu thuong, cuu tong, cuu chong
doc hieu » toc thieu, hoc thieu, hoc hien
dinh cuu » dinh chi
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
toan cao » toan ban, toan tap

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 - hanh dinh cuu thong ((cong van) OR (song van)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh dinh cuu thong ((cong van) OR (song van)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh dinh cuu thong ((cong van) OR (song van)) toan cao*.