Perhaps you should try some spelling variations:
"coder precoder loop control problems" » "coder precoder loop control program" (Expand search), "coder decoder loop control problems" (Expand search), "coder precoder hp control problems" (Expand search), "coder precoder amp control problems" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons 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 precoder loop control problems") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder precoder loop control problems\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder precoder loop control problems ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder precoder loop control problems") OR ("api python python python programming"))*.