Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dang » cua cong, cua ban
hai thap » khai thac, hai thanh, nhap thap
hai tap » bai tap, han tap, hai tan

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 - canh tranh cua dang cong ((hai tap) OR (hai thap)) cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh tranh cua dang cong ((hai tap) OR (hai thap)) cac".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh cua dang cong ((hai tap) OR (hai thap)) cac*.