Make sure that the geo search index [Geometrical search index] exists for products that you want to use for the geo search.
PARTadmin > Index management [Index administration] > Catalog selection > Context menu command "Geo search index [Geometrical search index]" > Create/Update
Under Percentual fraction, set100%. This ensures that you achieve the best possible hits when the Include component size [Include Part Size] option is activated.
PARTadmin -> Index management [Index administration] -> Geo search index [Geometrical search index] -> Create/update [Create/Update] -> Percentage share [Percental fraction]