Corpora

Corpora are very interesting tools for the teaching of ESP. This one offers Web Collocations (for single words) that you can use for writing your paper:

http://flax.nzdl.org/greenstone3/flax?a=p&sa=about&c=learningcollocations

You also have the Web Pharase option, where you can type your phrase and recover the word frequency with which it collocates:

http://flax.nzdl.org/greenstone3/flax?a=p&sa=about&c=phrases