Google is showing irrelevant pages in SERP

Hello Webmasters,
I need your help. I work for a web development company. Suppose my website is xyz.com and inner pages are xyz.com/php-web-development, xyz.com/joomla-web-development, xyz.com/wordpress-web-development, xyz.com/magento-web-development etc.
My target market is google.com.au, Now the problem is this – when I search "Hire PHP Developer Melbourne" in Google, Google doesn't show the relevant page. Google is showing this page xyz.com/joomla-web-development rather than…
Google is showing irrelevant pages in SERP

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