English keyword to local google (Vietnam)

Hi,

I have built many backlinks to promote 2 keywords on my site. One is "cau truc", another is "crane".
Two words are the same in each language.

But only "cau truc" is on top 3 at google.com.vn.

The "crane" is not top 100 at google.com.vn.

Please guide me more if I do something wrong.

My site: http://www.megastarenc.com.vn

thanks

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