There can be many reasons a web site doesn't show up, or display well, in search engines results.
Any of the following can affect on your web sites search engine positioning, and web traffic.

• You may not be using a search engine optimized web design,

• Your site may not be readable by the engines

• May be missing information critical to properly index your webpage.

• Use of some scripts can prevent search engine spiders or bots from crawling your web site or reading its content.

• Hopefully your site has not been banned or penalized by the Search engine's for some black hat trick.

• Not been properly submitted.

Note - Repeated submissions to search engines will not help.
Never employ a service which automatically or manually submits your site to search engines more than once, this is unnecessary, and can be considered spam by some engines and major directories