Perhaps you should try some spelling variations:
"modeling computation in string problem" » "modeling computational in string problem" (Expand search), "modeling simulation in string problem" (Expand search), "modeling notation in string problem" (Expand search), "modeling computation and string problem" (Expand search), "modeling computation of string problem" (Expand search), "modeling imputation in string problem" (Expand search), "modeling computation in sizing problem" (Expand search), "modeling computation in rostering problem" (Expand search), "modeling computation in sharing problems" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modeling computation in string problem\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( modeling computation in string problem ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("modeling computation in string problem") OR ("using coding python python programming"))*.