Can I use keywords in Safari as Google Chrome? The main reason because I use Google Chrome on my Mac is its keyword feature that I can use as shortcut while I'm searching for something.

This is an example of my main keywords: http://i.imgur.com/dORgCC0.png

This is an example of keyword feature in action: http://gfycat.com/IlliterateBiodegradableGreatargus

Is there a way to do the same on Safari?
KeySearch sounds like what you want. From the website:

It uses short keywords to allow you to search any site you want, right from the toolbar.
...
Just right-click on any search box and choose &quot;Create keyword for this search.&quot; Type in a keyword and KeySearch takes care of the rest.

(I have not used it.)