Consider synonym - e.g. "life jacket" could be referred to as a "life preserver" or "personal flotation device"
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Focus your search by first identifying a Standards Issuing Body that is likely to create standards for your area of interest (e.g. Search for ASTM standards if you are looking for "testing" standards, search SAE standards if your topic has automotive or aerospace applications, etc.)
Use parentheses to search key terms as a phrase, rather than independent keywords (e.g. "life preserver" instead life preserver).