Perhaps you should try some spelling variations:
"coder coder decoder fixed effects" » "coder encoder decoder fixed effects" (Expand search), "coder coder disorder fixed effects" (Expand search), "code code decoder fixed effects" (Expand search), "decoder codec decoder fixed effects" (Expand search), "codesc poder decoder fixed effects" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ 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 coder decoder fixed effects") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder decoder fixed effects\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder decoder fixed effects ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder decoder fixed effects") OR ("_ python python python programming"))*.