This might be what you want, not sure.
1) Put all the Word files in one folder
2) Go to Allen Browne's site and look for the function to List Files to a Table. This will put the full path of each file in an Access table and as a record for each file.
3) To the table you made to accomodate Allen Browne's function, add a memo field.
4) Make a form for this table.
5) Make some code that will open the Word doc based on the file name in the table record, the code then does the counterpart of Select All and Copy on the open Word doc. The code then pastes the Word doc into the memo field and then closes the Word doc. Make the code so it will run through the record set.
6) Make a query and with a created field and have FieldNameExp1: InStr([abc],Forms!Form1!Text0). If the key word does not exist the field value will be 0 if it does exist there will be number which is the number of characters that indicates it position. Thus, you want open all the Word docs where the value in the InStr field is >0.
If Form1 is open then the key word is entered in the text box. If the form is not open a parameter box will open and the keyword is entered.