Have you tried "Verbatim" mode? It's under the Search Tools drop down along the top menu bar (where News, Images etc. are), then under "All results", and basica

Have you tried "Verbatim" mode? It's under the Search Tools drop down along the top menu bar (where News, Images etc. are), then under "All results", and basically seems to minimise the amount of clever business Google does with your search (synonyms, "did you mean?" etc) and so can be quite useful for technical searches