Perhaps you should try some spelling variations:
"coder coder using rasch problems" » "coder coder using rich problems" (Expand search), "coder coder using search problems" (Expand search), "coder coder using brasil problems" (Expand search), "coder decoder using rasch problems" (Expand search), "code code using rasch problems" (Expand search), "decoder codec using rasch problems" (Expand search), "coder coders using rasch problems" (Expand search), "coder cover using rasch problems" (Expand search), "coder code using rasch problems" (Expand search)
"in python python python programming" » "in pythons python python programming" (Expand search), "in piton python python programming" (Expand search), "in pitons python python programming" (Expand search), "_ python 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: (("coder coder using rasch problems") OR ("in python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder using rasch problems\") OR (\"in python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder using rasch problems ) OR ( in python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder using rasch problems") OR ("in python python python programming"))*.