Perhaps you should try some spelling variations:
urban transport » road transport
demand local » demand model, demand level, demand low
luis c1 » luis c
c1 heat » 1 heat, 11 wheat, pcm heat
1 urban » 2 urban, 4 urban, 3 urban
4 cash » 4 case, a cash, 5 cash
_ cash » _ case
luis 1 » luis f, luis c, luis a

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( luis c1 heat transfer ((4 cash) OR (_ cash)) ) OR ( luis 1 urban transport demand local ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( luis c1 heat transfer ((4 cash) OR (_ cash)) ) or ( luis 1 urban transport demand local ))~".
• Adding a wildcard symbol may retrieve word variants: (( luis c1 heat transfer ((4 cash) OR (_ cash)) ) or ( luis 1 urban transport demand local ))*.