Perhaps you should try some spelling variations:
"communications technologies progress." » "communication technologies progress.", "communications technology progress.", "communication technology progress.", "communications technological progress.", "communications technologies program.", "communications technologies processes."
"sanitation technology congresses." » "irrigation technology congresses.", "education technology congresses.", "communication technology congresses.", "sanitation sociology congresses."

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: "((\"sanitation technology congresses.\") OR (\"communications technologies progress.\"))~".
• Removing quotes may allow a broader search: (( sanitation technology congresses. ) OR ( communications technologies progress. ))~.
• Adding a wildcard symbol may retrieve word variants: (("sanitation technology congresses.") OR ("communications technologies progress."))*.