Perhaps you should try some spelling variations:
"coder modeling using design errors" » "cover modeling using design errors" (Expand search), "cover modelling using design errors" (Expand search), "order modeling using design errors" (Expand search), "coder model using design errors" (Expand search), "coder models using design errors" (Expand search)
"api piton python python programming" » "api piton pythons python programming" (Expand search), "api piton pitons python programming" (Expand search), "api piton pytm python programming" (Expand search), "api pitons python python programming" (Expand search), "api in python python programming" (Expand search), "api with python python programming" (Expand search), "api python 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: "((\"coder modeling using design errors\") OR (\"api piton python python programming\"))~".
• Removing quotes may allow a broader search: (( coder modeling using design errors ) OR ( api piton python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder modeling using design errors") OR ("api piton python python programming"))*.