How to add your own custom search engine to Chrome

 Settings -> Search -> "Manage search engines..." -> "Other Search Engines"

Try https://goyun.info as an example:

• Add a new search engine: search job - this is only for use here, you won't see this anywhere else
• Keyword (shortcut): goyun — this will be used to trigger a custom search in the Omnibox; for convenience, use an abbreviation of what you'll be searching
• URL with %s in place of search: https://job.goyun.info/index.jsp?keys=%s — for most blogs and news sites, you'll use the URL and add search?q=%s, but other sites vary (see below)

To find the URL needed to create a custom search outside of a blog or news site, it's quickest to simply Google it, e.g. "Twitter search Chrome custom search". Here's a handy list to start, collected across the web:

Social Media

• Twitter - http://twitter.com/search?q=%s
• Facebook - https://www.facebook.com/search/more/?q=%s
• LinkedIn - http://www.linkedin.com/commonSearch?type=people&keywords=%s&search=Search
• YouTube - http://www.youtube.com/results?search_query=%s
• Pinterest - http://www.pinterest.com/search/pins/?q=%s

Google

• Gmail - https://mail.google.com/mail/u/0/#search/%s
• Google Drive - https://drive.google.com/#search/%s
• Google News - https://www.google.com/search?q=%s&tbm=nws
• Google Images - https://www.google.com/search?site=imghp&tbm=isch&q=%s

• Google Search Limited to Past Year - https://www.google.com/search?hl=en&tbo=1&tbs=qdr:y&q=%s
• Current Domain - javascript:location='http://www.google.com/search?num=100&q=site:'%20+%20escape(location.hostname)%20+%20'%20%S'%20;%20void%200

• Giphy - http://giphy.com/search/%s
• Flickr Creative Commons - http://www.flickr.com/search/?q=%s&l=cc&ct=0&mt=all&adv=1