Hoping a blog entry to generate more traffic for your blog? Just one word can spell a difference of thousands in search engines when you title your entries. So if it's a prime post you're typing up, take the trouble to check your intended title and its various variations first in your search engine of choice. Which generates less competition? Less competition would mean your entry is more likely to come up at the top, you know.
Same wonderful principle if you want to capture niche searches. You can search Google Trends too for inputs as to which topics are regularly searched but are not generating enough material in the web.
And always remember, few ever really search for complete sentences and using correct grammar. Usually, we just type phrases first. So, although you need not title your posts using phrases, you still might want to keep it simple.