Perhaps you should try some spelling variations:
tree complexity » the complexity (Expand search), time complexity (Expand search), tone complexity (Expand search)
blockes python » blockmesh python (Expand search)
using blockes » using block (Expand search), using locked (Expand search), housing blocks (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
coder tree » modern tree (Expand search), under tree (Expand search), poder tres (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 tree complexity control program ) OR ( using blockes python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder tree complexity control program ) OR ( using blockes python python programming ))*.