Use a ? to replace a single character such as tr?-80 or use a * to replace multiple characters such as t*80.
Enclose your query in quotation marks like this "zilog 80 specifications".
Search for results beloning to a specific domain, by specifying "site:" and "url:" search syntax, e.g. a search for "coco site:www.digibarn.com" will search for all references to coco on the Digibarn site.