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
cong nong » cong dong, cong cong, cong trong
nong san » cong san, dong san, nong dan
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, 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: ho ((chieu sang) or (hieu lang)) - ((hanh trinh) OR (hanh chinh)) cua cong nong san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - ((hanh trinh) OR (hanh chinh)) cua cong nong san than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - ((hanh trinh) OR (hanh chinh)) cua cong nong san than cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - ((hanh trinh) OR (hanh chinh)) cua cong nong san than cao*.