Perhaps you should try some spelling variations:
"using agile using sampling error" » "using agile using subsampling error" (Expand search), "using agile using saline error" (Expand search), "using agile using samples error" (Expand search), "using agile using sampling effort" (Expand search), "using active using sampling error" (Expand search), "using while using sampling error" (Expand search), "using angle using sampling error" (Expand search), "using aging using sampling error" (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: "((\"using agile using sampling error\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( using agile using sampling error ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using agile using sampling error") OR ("using coding python python programming"))*.