I want to use google font on my host to speed up my website. To reduce the font file size.

1. Of course I only use one font family (Roboto) and two styles: regular and 700. Character Sets: vietnamese and latin
2. I have uploaded my font file, the link is working
3. CSS:

/* roboto-regular – vietnamese_latin */
@font-face {
font-family: ‘Roboto’;
src: local(‘Roboto’), local(‘Roboto-Regular’),
url(‘https://lamdepsao.com/wp-content/fonts/roboto-v20-vietnamese_latin-regular.woff2’) format(‘woff2’), /* Chrome 26+, Opera 23+, Firefox 39+ */
url(‘https://lamdepsao.com/wp-content/fonts/roboto-v20-vietnamese_latin-regular.woff’) format(‘woff’); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
}
/* roboto-700 – vietnamese_latin */
@font-face {
font-family: ‘Roboto’;
src: local(‘Roboto Bold’), local(‘Roboto-Bold’),
url(‘https://lamdepsao.com/wp-content/fonts/roboto-v20-vietnamese_latin-700.woff2’) format(‘woff2’), /* Chrome 26+, Opera 23+, Firefox 39+ */
url(‘https://lamdepsao.com/wp-content/fonts/roboto-v20-vietnamese_latin-700.woff’) format(‘woff’); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
}

4. and a google font blocking plugin (it works)

It all works but on my website only Style 700 for all is displayed.
The content of my article is displayed as slyte 700, so does the description of the article on the homepage. All are 700 styles You check my website. Help me