Perhaps you should try some spelling variations:
recast prestressed » precast prestressed, cast prestressed, precast prestress
concrete pipes » concrete piles, concrete pipe, concrete poles
concrete types » concrete terms

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: "recast prestressed ((concrete pipes) OR (concrete types))".
• Adding a wildcard symbol may retrieve word variants: recast prestressed ((concrete pipes) OR (concrete types))*.