Perhaps you should try some spelling variations:
"engine optimization python computer program" » "engine optimization method computer program" (Expand search), "engine optimization option computer program" (Expand search), "engine optimization methods computer program" (Expand search)
"spatial variation in coding program" » "spatial variation in cloning program" (Expand search), "spatial variation in loading program" (Expand search), "spatial variation in cooling programs" (Expand search), "spatial variation on coding program" (Expand search), "spatial variation in decoding program" (Expand search), "spatial variation non coding program" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("spatial variation in coding program") OR ("engine optimization python computer program"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"spatial variation in coding program\") OR (\"engine optimization python computer program\"))*".
• Removing quotes may allow a broader search: (( spatial variation in coding program ) OR ( engine optimization python computer program ))*.