Perhaps you should try some spelling variations:
estimation problem » restoration problem (Expand search), optimization problem (Expand search), education problem (Expand search)
model estimation » motion estimation (Expand search), model evaluation (Expand search), time estimation (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
coder coder » coder decoder (Expand search), code code (Expand search), decoder codec (Expand search)
coder model » cover model (Expand search), decoder model (Expand search), copper model (Expand search)
api python » rpa python (Expand search), manim python (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: "(( coder coder model estimation problem ) OR ( api python python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder coder model estimation problem ) OR ( api python python python programming ))*.