It significantly narrows your search results, and it should be used as often as possible. A few of the search engines, allow a NEAR search operator. This focuses the search and gives the keywords a higher relationship to each other. Most search engines interpret lower case letters as either upper or lower case. Thus, if you want both upper and lower case occurrences returned, type your keywords in all lower case letters.
Most search engines interpret singular keywords as singular or plural.
If you want plural forms only, make your keywords plural. A few search engines support truncation or wildcard features that allow variations in spelling or word forms. A web page is composed of a number of fields, such as title, domain, host, URL, and link. Searching effectiveness increases as you combine field searches with phrase searches and Boolean logic. In addition to the title search, other helpful field searching strategies include the domain search, the host search, the link search, and the URL search.