Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
dung cong » dung trong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - hanh tranh cua ((dung cong) or (dung ung)) dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh tranh cua ((dung cong) OR (dung ung)) dan than tap.
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh tranh cua ((dung cong) or (dung ung)) dan than tap*.