Perhaps you should try some spelling variations:
"based estimation in constraint programming" » "and estimation in constraint programming" (Expand search), "speed estimation in constraint programming" (Expand search), "based investigation in constraint programming" (Expand search), "based estimation of constraint programming" (Expand search), "based estimation and constraint programming" (Expand search), "based estimation in constrained programming" (Expand search), "based estimation _ constraint programming" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking 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: (("based estimation in constraint programming") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"based estimation in constraint programming\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( based estimation in constraint programming ) OR ( using coding python python programming ))*.