Perhaps you should try some spelling variations:
"coder perturbation in precoder program" » "holder perturbation in precoder program" (Expand search), "order perturbation in precoder program" (Expand search), "under perturbation in precoder program" (Expand search), "coder perturbation in proder program" (Expand search), "coder perturbation in recovery program" (Expand search), "coder perturbation in precoce programa" (Expand search), "coder perturbations in precoder program" (Expand search), "coder perturbation of precoder program" (Expand search), "coder perturbations of precoder program" (Expand search), "coder perturbation in premodern program" (Expand search), "coder perturbation and precoder program" (Expand search), "coder perturbation to precoder program" (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), "rpa 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 perturbation in precoder program") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder perturbation in precoder program\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder perturbation in precoder program ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder perturbation in precoder program") OR ("api python python python programming"))*.