Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
trong van » trong cac
doc hieu » toc thieu, hoc thieu, hoc hien
dang cua » mang cua, hang cua, tang cua
dong cua » cong cua, huong cua, thong cua
dung cua » dung luan, dung cho
van than » van thanh, van thang, van tuan
than cao » toan cao, thai cao, than cap

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 - nhan ((dang cua) or (((dong cua) OR (dung cua)))) dung trong van than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - nhan ((dang cua) OR (((dong cua) OR (dung cua)))) dung trong van than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - nhan ((dang cua) or (((dong cua) OR (dung cua)))) dung trong van than cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - nhan ((dang cua) or (((dong cua) OR (dung cua)))) dung trong van than cao*.