I've put in my thoughts on different Google penalties on websites that prevents sites ranking high in SERPs for the keyword they target for.
Some of the important factors are:

1. Google Sandbox:

2. Google Slap:

3. Websites Deindexed:

Read full post here: Different forms of Google penalties

Free method to find Exact Match Domain Names:
1. Type the root keyword in Google adwords keyword tool, example "winter boots" add filter to show keywords that only have minimum local search of 1000 (based on your requirement). Select exact match, uncheck brad and phrase matches. Run the query.

2. The list will be displayed, select download as csv option to download all the keywords as a csv file.

3. The keywords in CSV file have [] in them, as we used...

Exact Match Domain Names were and are lifeblood for Search engine traffic.

Google (and Bing) are default search engines in many internet browsers or it is set as home page which acts as the gateway to the Internet.

People even go to their well known favorites sites via the search engines like google and bing.

EMD can boost your rankings in search engines, read the complete post on how EMDs work here:

Get Auto Exact match domain finder software here...

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Use Hostgator hosting for at least 3 months (or 90 days) so that you can use the Google Adwords promotional code completely legit per Google and Hostgator terms.

Hostgator provides $100 worth of Google Adwords Coupon...

Alternatively, you might not have any idea at all. This does not need to
be a problem, because coming up with ideas for a site is not difficult.
With almost any idea that you could come up with, there are people
searching the internet for information about it, so every idea is valid.
Whether you have an idea now or you pick one up by following the
research strategy that I am about to recommend, there are a couple of
things that you have to do.
...