Hi @hesham3mara,
Thanks for posting in the Spotify Community!
Spotify is constantly working add new content to the platform around the clock as and when the content is made available to them Hopefully your favorite music will be up soon.
Keep in mind availability can vary over time and between countries, depending on agreements between Spotify and rights holders, such as artists or record labels therefore Content sometimes isn't available straight away.
In the meantime, you can also import a local file to your Spotify library if you have this song as a file on your computer.
Also, you can always feel free to contact the artist or record label with your query regarding why this song isn't currently available on Spotify.
I hope this helps, and let us know if you have any other questions.
Have a good day!