Which of the two options will give good result in term of searching/retrieval?

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Is there any one who can provide a donation of HPV detection and genotyping kits in exchange collaboration forms?

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Ibrahim Adeyanju

You need to expantiate a bit on what you are trying to do. Co-occurrence of two words might be used as an indication of similarity; LSA is based on this logic. I'm not sure of what co-occurrence of documents and words mean?

Michael Flor

Co-occurrence of words with documents can also be used as a measure for semantic similarity. This was done, for example, in Explicit Semantic Analysis (ESA), http://www.cs.technion.ac.il/~gabr/resources/code/esa/esa.html