Perhaps you should try some spelling variations:
"and complexation in coverage problem" » "and completion in coverage problem" (Expand search), "and complication in coverage problem" (Expand search), "and complications in coverage problem" (Expand search), "and complexation in covering problem" (Expand search), "and complexation in covering problems" (Expand search), "and complexation in coverage from" (Expand search), "and complexation and coverage problem" (Expand search), "and complexation of 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.

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