Perhaps you should try some spelling variations:
chi xanh » chi anh, chi danh, chieu xanh
chi hanh » chi nhanh, chi thanh, thi hanh
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong bai » cuong bai, cong hai, cung bai
bai tao » bai tap, tai tao, ai tao
tao cao » bao cao, toan cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi xanh) OR (chi hanh)) - canh tranh ((cua dung) or (cua dang)) cong bai tao cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi xanh) OR (chi hanh)) - canh tranh ((cua dung) OR (cua dang)) cong bai tao cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi xanh) OR (chi hanh)) - canh tranh ((cua dung) or (cua dang)) cong bai tao cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chi xanh) OR (chi hanh)) - canh tranh ((cua dung) or (cua dang)) cong bai tao cao*.