Hello all , I am new contributor , just ask if keywords should by only one word OR it could be more

As a customer, when I go hunting for assets, I use plus (+) signs between keywords like this:

https://stock.adobe.com/search?k=blue+hydrangea+flower+arrangement

Then, I refine my search with filters on the left side panel. 

Hey ​@Baher Meditation Lover 
When it comes to keywords: spice them up a bit. Add a bit of salt, pepper, and other spices into the mix. Describe your image in a way a smart and clever 4th or 6th grader would be asking Qs or looking for something.

Male doing Yoga.
Blue Shirt
Outside, On the beach

Cheers
Nate

Do you think if I put “Sound healing therapy” as one key 
and the buyer search with “Sound therapy “it will return it? hmm, I do not think so? 
But If I put 1. sound 2. healing 3. therapy (as three keys) it will return it, right?

Decide how you think a buyer would search. If you think a buyer would search for a compound word then use it. Personally, I dont think it matters. I just searched for:
1. kissing,  monkey
2. kissing monkey
3. monkey kissing
All three variations returned 867 assets in the identical order.
This means, the algorithm ignored the “,” and the keyword order.