Perhaps you should try some spelling variations:
disease controlled » disease:a controlled (Expand search), disease controlling (Expand search), disease control (Expand search)
controlled crosses » controlled crossover (Expand search)
python regius » python redes (Expand search)
regius python » reais python (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
decrease of » decrease in (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease of disease controlled crosses ) OR ( python regius python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease of disease controlled crosses ) OR ( python regius python python programming ))*.