NopCommerce compare string with greek phrases

Question

I use Nopcommerce 3.5 and I need to compare a string coming from database (groupList[0].SpecificationAttributeName) with a greek phrase inside the .cshtml file, but it fails. I have tried string.Equals(string), string.Equals(string, StringComparison), string.IndexOf but all failed. The comparison between two english words succedes though. Do you know any solution on this.

Thanks in advance.