Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
cua bang » chua bang, cua ban, cua dang
cong van » cong vang, song van, cong tan
cong san » cong tac
tuan tai » toan tai, quan tai, tan tai

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 - thanh trung cua bang ((cong van) OR (cong san)) tuan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh trung cua bang ((cong van) OR (cong san)) tuan tai".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung cua bang ((cong van) OR (cong san)) tuan tai*.