What is not found in search engines

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Search Engine 9238

No search engine is absolutely impossible, but search engine is not omnipotent;

Some of the content, online obviously exist, but you use search engines do not search. If you understand what the search engine can and can't do beforehand, you can design a better search strategy. Before searching, consider the search strategy, which is the most critical step in search success.

There are 3 main categories of such content:
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1, online there, but the search engine library does not
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1.1 Spider the nature and file types of Web pages that were not properly handled
(such as flash, script, PS, some dynamic Web pages and frame, database)
1.2 No Island Web page pointing to Links
1.3 Spider access is just a dead link for some reason
1.4 is considered a bad Web page without catching
1.5 Because of/pornography/reactionary/spam/and other problems without catching the illegal web page
1.6 Web pages that you need to enter a username or password to open
1.7 website uses the robots protocol to reject the search engine crawl the webpage
1.8 Search engines haven't had time to crawl the new page
1.9 Gopher, newsgroups, Telnet, FTP, WAIS, etc. non-HTTP information
1.10 website database did too bad, spider a catch on the downtime, had to not catch

2, search engine library has, but failed to correctly index the information in the Web page
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2.1 Error caused by participle
2.2 Text information in graphics you can read it, but the search engine can't read it.
2.3 Stop words and other search engines deliberately do not index information
2.4 Search engines have selected indexes on some pages, not all Web page information

3, the search engine correctly indexed the information in the Web page, but with the keyword you use different
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3.1 Your search keyword contains typos
3.2 Web page authors use typos
3.3 No typos, but the Web page author uses the vocabulary and your keywords are different, after all, the character of the characters, allow the N way to express the same kind of information
3.4 Simplified Traditional coding