Resumes are a very important item to hunt for when looking/investigating on a particular person. This is because resumes have a sort of useful and complete biodata of a respective person like birthday(birthdate), gender, religion, qualifications, email, phone number, social media links/handles, address, possible that his/her resume has a picture of him/her for identification purposes, etc.
Now unlike other highly personal and useful information, you might be thinking what and how is Qualification used/needed for ?? Actually, all Institutes across the world maintain a Database of all the students/people who are doing/who did their respective qualifications for that place. So lets assume that we know the college from where a person (lets name him "ABCXYZ"). Now all we need to do is to do some research about that Institute, get some data about the Institute or/and "ABCXYZ" (by exploitation or social engineering), then voila we have what we wanted to have.
Platforms like Google, Twitter and LinkedIn might be quite useful in this aspect.
Also a general syntax/trick to find resumes and also all other kinds of precise stuff on search engines is -
"ABCXYZ" resume(or any other document) filetype: pdf/doc/xls(and so on...)
"ABCXYZ" resume(or any other document) site: google.com/drive.google.com/bing.com(and so on...)
LINKS
Google - https://www.google.com/
Twitter - https://twitter.com/home
LinkedIn - https://www.linkedin.com/feed/