Perhaps you should try some spelling variations:
"using sample in coverage problem" » "using sample in covering problem" (Expand search), "using sample in covering problems" (Expand search), "using sample in coverage from" (Expand search), "using samples in coverage problem" (Expand search), "using simple in coverage problem" (Expand search), "using simplex in coverage problem" (Expand search), "using sample and coverage problem" (Expand search), "using sample of coverage problem" (Expand search), "using sample _ coverage problem" (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 sample in coverage problem") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using sample in coverage problem\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( using sample in coverage problem ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using sample in coverage problem") OR ("using coding python python programming"))*.