The combination of Full-text search and Sketch search (2D) definitely makes sense. May be only the umbrella term is known, however, you can further specify with a little sketch.

The following figures may give some descriptive examples:

Bolt + = Hexagon head bolt

Handle + = e.g. Cabinet "U" handle or Pull handle

Handle + = e.g. Design furniture handle

Handle + = Segment bow handle

Angle + = Connecting angle

Angle + = e.g. Frame bracket