How to find a word or phrase in libre office?

version, language, and component (Writer, Draw, etc.) of LibreOffice
Version:–Build ID: 420m0(Build:2)

System: Host: bob-HP-Pavilion-dv1000-EH439UA-ABA Kernel: 3.13.0-24-generic i686 (32 bit, gcc: 4.8.2)
Desktop: Gnome Distro: Linux Mint 17 cinnamon Qiana–Current and updated. HP Pavilion dv1000,2K ram-- language: English

A helpful Search feature.
How to find a word or phrase like Case 1:
If I wanted to search for a phrase or word within one document for certain word(s) such as: red car (or “car”) be highlighted/indicated?
Could all the the phrases that have the line “Red Car” (car) be highlighted/indicated?

How to find a word or phrase like Case 2:
Could all the Libre Office documents that contain the phrase “red car” (Or Red Car") be highlighted/indicated.

Regular expressions.

I can help in respect of case 1 only.
Open the Document in question. Press Ctrl+F and enter the search phrase or word and then click Find All. You will see the occurances all highlighted.

I know of no way to search documents which have not been opened from within LibreOffice.