Perhaps you should try some spelling variations:
"model estimation python _ program" » "model estimation portion _ program" (Expand search), "model estimation method _ program" (Expand search), "model animation python _ program" (Expand search), "motion estimation python _ program" (Expand search), "model evaluation python _ program" (Expand search), "time estimation python _ program" (Expand search)
"in python python python programming" » "in pythons python python programming" (Expand search), "in piton python python programming" (Expand search), "in pitons python python programming" (Expand search), "_ python python python programming" (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: (("model estimation python _ program") OR ("in python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"model estimation python _ program\") OR (\"in python python python programming\"))".
• Removing quotes may allow a broader search: (( model estimation python _ program ) OR ( in python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("model estimation python _ program") OR ("in python python python programming"))*.