Perhaps you should try some spelling variations:
"underground blasting" » "underground blast", "underground building", "underground cabling"
"underground workings" » "underground works", "underground openings", "underground mining"
"underground parking" » "underground mining", "underground parts", "underground openings"
"underground banking" » "underground mining", "underground tanks", "underground openings"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("underground blasting") OR ((((("underground parking") OR ("underground banking"))) OR ("underground workings")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"underground blasting\") or (((((\"underground parking\") OR (\"underground banking\"))) or (\"underground workings\"))))".
• Removing quotes may allow a broader search: (( underground blasting ) or ((((( underground parking ) OR ( underground banking ))) or ( underground workings )))).
• Adding a wildcard symbol may retrieve word variants: (("underground blasting") or ((((("underground parking") OR ("underground banking"))) or ("underground workings"))))*.