Perhaps you should try some spelling variations:
development matter » development matters, development master, development pattern
technology private » technology preface, technology rate, technology related
del communication » cell communication, real communication, cell communications
water development » career development, sector development
private tuition » private auctions, private section, private education
tuition 2011 » edition 2011, edition 2012, edition 2013
2011 crisis » 2010 crisis, 11 crisis, 2.1 crisis
costs water » costs matter, costs peter, costs chapter
crisis del » crisis desde

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• Adding a wildcard symbol may retrieve word variants: technology private tuition 2011 crisis del communication costs water development matter _.*.