Technical Reports are documents that detail progress of research produced by the government or that is funded by the government. Some of this research can be found in an article database like Scopus, but some cannot. Science.gov does search all areas of engineering, though you may find it easier to search the government agency most aligned with your topic.
Science.gov searches multiple government agencies. You may find it easier to search for a specific agency's technical reports. Links to those resources are below.
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