Search results – potential problem?

I’ve just conducted a few searches on my website and in the symbiostock page and I’ve detected something that got me worried.

I’ve noticed that when a keyword is composed by two words it’s ignored by the search.

I have some images of garden snails that had as a keyword “garden snail” and also “snail”. When I searched by “garden snail” no result came up, but as snail they were found. I’ve deducted that since I did not have “garden” as a separated keyword the search was ignoring the term “garden snail”

The same happened to “bike helmet”, where I only had helmet.

After I added “garden” in the snail images and “bike” to the helmet bot came up in the searches.

Now, I find this a serious issue because many keywords are in fact composed of two words, and many times I believe many of us don’t add both words separately because one of the words alone may not make sense and we can get an image rejected because of keyword spam.

As this been detected previously?, Is this supposed to work like this? I think I’ll have a huge amount of images that will become invisible to extremely relevant searches because of this issue and going through all of them and check is a nightmare.

Can the searched be updated to consider keywords composed by more than one word?