There are a lot of factors that Google considers when it displays results to your search, defining exactly what it looks at can be hard to describe as Google's algorithms are always changing, but there are some factors that could be affecting the results of your website in the search engine.
- Poor SEO practice. Here is an article on this.
- Being overtaken by competitors with lots of paid advertising.
- Bad URL/domain name.
- Your site is new as you have recently launched it. Sometimes it can take longer than a week for a search engine to update search results.