How can I raise or improve my chance to have a job?

You can always find a job on Job sites like Bayt etc.
Keep adding additional qualifications to your career profile and have a habit of taking professional certifications to have an edge over others.
Rest all depends on your luck and gods will.

Hello Donya, Jobs are out there, though depends on the way you present yourself (i mean your profile) on any of the social job sites, especially here on Bayt.com.
You can equally enhance your oppurtunities by joining various blogs with your specific job interest in mind, and contributing by way of asking questions and enlightening others too about your own knowledge of the job.
Also, you need to know the industry-wide sought-after certifications and go for it (while updating your profile as your status changes), this will definitely put you in a better light.
Hope i was able to help.
Revert for clarity if you need any.

yes u can raise your chance through your resume.
As, this is very important all jobs are depending on your resume either you are apply via recruitment agency or directly to a company.

just write always the exact and technically correct details on your resume...
it is important be specific than generalizing the experience and trying to show the experience in various fields...
it is difficult when you say that you have six years experience in heavy construction..
instead..
you have to say that ...
six years of expertise experience in the field of heavy constructions of ..(what kind of heavy construction).....
as a ...(designation).....
gud luck