terms decomposition and query formation

Without introducing new word, a query string could be analyzied according pre-defined knowledge.
For example, the orignal query could be 道德经. as we know that 德经 is book too.
so we could expand the query into 道德经 " 德经". By using google, the results are different.

Another example is
the original query=MIT Computer Science and Artifical Intelligence Laboratory.
and
the expanded query= MIT computer science and artificial intelligence laboratory "artificial intelligence laboratory"
returns different set of results though no extra word are introduced.

More importantly, if the term knowledge base could supply information like category or subcategory, such extra information could be incorported into the orignal query and help improve the precision of search late.