Php search results

Hello everyone ... Im working on some kind of search engine for two little tables on text fields on mssql, and the text fields can be very large fields, im doing the search with SELECT FIELD FROM TABLE WHERE FIELD LIKE '%SOMTHING%' .. My question is: When displaying the search results i dont want to display the entire field, only the specific parts where the keyword was found , and bold for the keyword and i just dony know how to to do that, i mean displaying the keyword in bold is no problem .. I need to know how to display only the parts where this keyword is. Any help will be very helpful Thanks every1