I need offpage and onpage SEO.

I would like you to give me advise and to implement the SEO changes.

I have a website that needs to be optimised.

Our website started to run around July 2015. We have 2 languages: Vietnamese and English. We would like to find an agency that understand Vietnamese because we focus on 70% Vietnamese client to access the website. Really need an agency to consult and willing to change as your proposal to make the website better.