Perhaps you should try some spelling variations:
"testing computations using string theory" » "seeking computations using string theory" (Expand search), "testing imputation using string theory" (Expand search), "testing mutation using string theory" (Expand search), "testing computation using string theory" (Expand search), "testing populations using string theory" (Expand search), "testing computations in string theory" (Expand search), "testing computations using nursing theory" (Expand search), "testing computations using strong theory" (Expand search), "testing computations using spring theory" (Expand search), "testing computations using strains theory" (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: (("testing computations using string theory") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"testing computations using string theory\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( testing computations using string theory ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("testing computations using string theory") OR ("using coding python python programming"))*.