We all are familiar with World Wide Web or WWW for short. It has become
popular in the past few years. It is not difficult thing to do a Web search. But
to search successfully and fast needs some techniques. Otherwise you might
waste a lot of time and end up getting what you do not need. First, let us look
at search engines, directories and hydrids.
1. Search Engines
Search engines allow you to enter words or phrases that are matched against a
database usually created automatically, by robots or spiders. Search engines
craw l the web. Then you look to what they have found. Results depend on size of
database, frequency of updating, search capabilities and options of the search
engine.
2. Directories
On the other hand, a directory depends on humans for its listings. They allow
you to browse through lists of Web sites by subject or topic. They are
selective databases compiled into organized indexes. Directory databases are
smaller. So, the results are often fewer.
3. Hydrid Search Engines
Some search engines maintain an associated directory. Webmasters can submit
the ir sites for review, but there is not guarantee that it will be included in
a se arch engine's directory. Reviewers often keep an eye on sites submitted to
announcement places, then choose to add those that look appealing.
4. How to do an effective search?
There are few steps you can prepare. You can use one, combine some or all of
th em for an effective search.
a. Identify important concepts of your search. In other words, define what
you are looking for.
b. Identify search keywords to describe those concepts.
c. Consider synonyms, related words, and variations of the terms such as
plurals .
d. Use search logic to refine the search. Sometimes you need to reverse the
order of words to make it more effective.
e. Apply Boolean search logic. Boolean operators are key to successful
searches . With words AND, OR and NOT you can expand or narrow down a search
dramatically.
To broaden: use OR and synonyms.
To narrow down: use AND and precise
keywords.
To exclude: use NOT.
f. Use parentheses and double quotes to force search engine read in the order
you want.
g. Use plus sign (+) to include more interest and minus sign (-) to exclude.
h. Finally, try more than one search engine to find the results you are
looking for.
4. Some examples
"Viet Nam" +Saigon -conflict -war --> will find information on Viet Nam
especially about Saigon without finding information on the conflict.
"Abraham Lincoln" AND "civil war"
("Abraham Lincoln") AND NOT ("civil war")
"Los Angeles" OR "New York City"
(dogs OR cats) AND ("pet care")