Perhaps you should try some spelling variations:
"using computational modern code problems" » "using computational model code problems" (Expand search), "using computational models code problems" (Expand search), "using computational mode code problems" (Expand search), "and computational modern code problems" (Expand search), "using computational modern core problems" (Expand search), "using computational modern model problems" (Expand search), "using computational modern some 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("using computational modern code problems") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computational modern code problems\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( using computational modern code problems ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computational modern code problems") OR ("using coding python python programming"))*.