Perhaps you should try some spelling variations:
"airports -- design and construction." » "imports -- design and construction.", "airports -- design and reconstruction.", "airports -- design and instruction.", "airports -- design and constitution."
"airports -- design and introduction." » "imports -- design and introduction."
"airport -- design and construction." » "airport -- design and reconstruction.", "airport -- design and instruction.", "airport -- design and constitution."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("airports -- design and construction.") OR ("airport -- design and construction."))) or ("airports -- design and introduction."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("airports -- design and construction.") OR ("airport -- design and construction."))) OR ("airports -- design and introduction.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"airports -- design and construction.\") OR (\"airport -- design and construction.\"))) or (\"airports -- design and introduction.\"))".
• Removing quotes may allow a broader search: (((( airports -- design and construction. ) OR ( airport -- design and construction. ))) or ( airports -- design and introduction. )).
• Adding a wildcard symbol may retrieve word variants: (((("airports -- design and construction.") OR ("airport -- design and construction."))) or ("airports -- design and introduction."))*.