Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
tong tap » tuong tac, trong tan, cong tac
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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: theo hieu lang - hanh tranh cua cong ((tong tap) or (((cong tan) OR (cong san)))) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh tranh cua cong ((tong tap) OR (((cong tan) OR (cong san)))) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh tranh cua cong ((tong tap) or (((cong tan) OR (cong san)))) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh tranh cua cong ((tong tap) or (((cong tan) OR (cong san)))) toan cao*.