Perhaps you should try some spelling variations:
"learning combinatorics _ precoder program" » "teaching combinatorial _ precoder program" (Expand search), "learning combinatorics _ proder program" (Expand search), "learning combinatorics _ recovery program" (Expand search), "learning combinatorics _ precoce programa" (Expand search)
"advanced python programming code program" » "advanced python programming model program" (Expand search), "advanced python programming models program" (Expand search), "advanced python programming course program" (Expand search), "advanced method programming code program" (Expand search), "advanced path programming code program" (Expand search), "advanced symphony programming code program" (Expand search), "advanced python programming code programs" (Expand search), "advanced python programming cove program" (Expand search), "advanced python programming coppe program" (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: "((\"learning combinatorics _ precoder program\") OR (\"advanced python programming code program\"))~".
• Removing quotes may allow a broader search: (( learning combinatorics _ precoder program ) OR ( advanced python programming code program ))~.
• Adding a wildcard symbol may retrieve word variants: (("learning combinatorics _ precoder program") OR ("advanced python programming code program"))*.