Perhaps you should try some spelling variations:
hanh trinh » canh tranh
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

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