Content for better SEO?

Hi Trang Pham.,
In Search Engine Optimization we call: "Content is the King" Nothing is better than unique content that we create ourselves.
But if you are writing content for SEO, you'd better to make a keyword research and target keyword phrase before writing and optimizing it.
Search Engine like Google they very smart, it know what is good and what's bad base on customers behavior on your website and on what's people do searching over it.
It's not necessarily to rewrite it's all but need to optimize it well base on the Onpage Seo techniques such as:
- Select good keyword phase
- The title have the keyword on top
- Keyword on the description
- Keyword on the
...

- Friendly URL
......
You will easy to get more visitor to you site and rank higher on Google.
Hope that help something on your team work.