Perhaps you should try some spelling variations:
"using model from coverage problem" » "using model from covering problem" (Expand search), "using model from covering problems" (Expand search), "using model from coverage from" (Expand search), "using model flow coverage problem" (Expand search), "using model crop coverage problem" (Expand search), "using model from beverage problem" (Expand search), "ising model from coverage problem" (Expand search), "using modis from coverage problem" (Expand search), "using mobile from coverage problem" (Expand search), "using models from 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 model from coverage problem") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using model from coverage problem\") OR (\"using coding python python programming\"))*".
• Removing quotes may allow a broader search: (( using model from coverage problem ) OR ( using coding python python programming ))*.