Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
ho hieu » ho chieu, hoi hieu, nho hieu

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

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