Perhaps you should try some spelling variations:
land transport » road transport
a transforming » _ transforming, 3 transforming, a transformative
demand level » demand travel, demand model, second level
luis 2 » luis f, luis c, luis a
2 land » 1 land, 4 land, 3.2 land
les am » yes am
les a » less a, les _, lee a

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( luis 2 land transport demand level ) or ( luis 2 a transforming ((les a) OR (les am)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( luis 2 land transport demand level ) OR ( luis 2 a transforming ((les a) OR (les am)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( luis 2 land transport demand level ) or ( luis 2 a transforming ((les a) OR (les am)) ))*".