Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
dong luan » dung luan, tong luan, cong luan
dong xuan » hoang xuan, dinh xuan, dong cua
trong van » trong cac
doc hieu » toc thieu, hoc thieu, hoc hien
van toan » van tuan, van tan, van thanh
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 ((dong luan) OR (dong xuan)) dung trong van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((dong luan) OR (dong xuan)) dung trong van toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((dong luan) OR (dong xuan)) dung trong van toan cao*.