Do you mean they are not passing the Google test or something else?
If they're semi-dedicated, they're most likely shared between a few different users, which increases the chances of getting blocked from Google and other sites.
I've even had "fresh" dedicated proxies not pass the Google test because the whole subnet or IP range was blocked.
Try dedicated proxies? Best suggestion is to, prepare your projects and then buy these stuff at the last minute or last hour. Don't leave them for days man
Semi dedicated proxies aren't really up to google scraping. Sometimes you get lucky and it works for a while then once someone else starts using them for a bit of googling they die instantly. Even dedicated proxies are unreliable at some sellers.
If you want to scrape google prepare yourself for shelling out some hard earned cash for real dedicated proxies and a voyage through proxy providers until you find the one.
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If they're semi-dedicated, they're most likely shared between a few different users, which increases the chances of getting blocked from Google and other sites.
I've even had "fresh" dedicated proxies not pass the Google test because the whole subnet or IP range was blocked.