Perhaps you should try some spelling variations:
communication worst » communication world, communication what, communication working
urban development » human development
relationship 2.1 » relationship 4.1, relationship 5.1, relationship 10.1
pt communication » put communication, et communication, post communication
2 relationship » 26 relationship, a relationship, 4 relationship
technology 2 » technology _, technology 1, technology 3
worst urban » cost urban, first urban, most urban
2.1 crisis » 3.1 crisis, 2010 crisis, 2011 crisis
crisis pt » crisis _, crisis a

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

• Adding a wildcard symbol may retrieve word variants: technology 2 relationship 2.1 crisis pt communication worst urban development _ artic.*.