Default site language is Greek. After English has been added, the search form(visible to the left of nearly every page) cannot find anything. I can give you admin access to the site, together with front-end access.
Please check it out, thank you.
I took a look at the site for you and noticed that you have not yet translated any of your Oliveoil posts to English. See Screenshot
This is why the English search is not working. The search will essentially only perform a filter on the posts that are in the language of the search form.
Once you've translated the post themselves then it should work fine.
Please let me know if this clears up the issue for you.
The knowledge we have here in the Toolset forums about WPML is quite limited. So if you want a more detailed response on how to achieve this then I would recommend that you get in touch with our WPML support team at the link below.
Where these translations created by doing it as a duplicate?
I suspect what is happening here is that the custom fields aren't getting populated correctly hence why the blank search.
As you can see from my test search below. hidden link
When i put 2.5 into the "Ποσότητα" field and hit search, the view returns the correct results. I tried to resave one of your translated posts but couldn't because I saw that there were a few required fields where they have not yet been translated so I couldn't save without these fields having a value.
I suspect resaving the posts will resolve the issue .
What is happening here is that a "Seller" user creates an "Oliveoil" in Greek, using a frontend cred form. All Oliveoils published by the Sellers, are searched using the search view in the left sidebar widget. This search only works for the Greek language. For the English language, it gives Nothing Found, which may be obvious, as there are no Oliveoils originally published in English.
Although I always get Nothing Found from the English search, I need to find a way to somehow automatically translate published Oliveoils to English. Please note, that all Oliveoil fields are predefined and so are translated already to English (all except the Notes field).
While i'm aware that you're not able to automatically translate the post while the greek version is being created, you are able to automatically bulk translate content.
For more details on translation queries I recommend contacting the WPML team.