Differences between SearchSimple and SearchAdvance.
Although both search methods use the basic procedure of searching by key words included in requested text , there are some differences in using them listed in the following table.

Search with	SIMPLE	ADVANCE
Article Code	No	Yes
Time Period	Yes, but defined	Yes
Author	Yes	Yes
Article Title	No	Yes
Division	No	Yes
Words included in text	Yes	Yes

How can we make a search with Words Included in Text?
By using special criteria, we can retrieve articles with great accuracy. These criteria include words and, if needed, logical expressions. The latter are formed using logical operators (AND, OR and NOT) and/or parenthesis ().

The use and meanings of logical operators and parenthesis are presented in the following table.

Operator	Symbol	Action
AND	+	Finds only the articles which include all the words which form the criteria. Eg. Greece+Athens retrieves the articles which contain both words.
OR	,	Finds the articles which include at least one of the words in the criteria. Eg. Greece,Athens retrieves the articles which contain either Greece or Athens. Some of the retrieved articles might contain both of the words.
NOT	-	Excludes all articles which contain the specified words. Eg. Greece-Athens retreives the articles which contain Greece excluding the ones containing the word Athens.
	()	Parenthesis can be used to form complex logical expressions in criteria. Eg. (Greece+Athens)+(Omonia,Syntagma) retrieves the articles which contain both Greece and Athens and also contain either Omonia or Syntagma or both.

The "WORDS INCLUDED IN TEXT" field works following the rules listed below:

• Words included in criteria must be seperated by a logical operator.
• Every word will be used to search an exact match. Alternatively, the asterisk * can be used to represent any series of characters. Eg. In order to find articles which contain words starting from polit, we use the expression polit*.
• Every word will be searched without perfoming an exact match of uppercase or lowercase letters (case insensitive matching).
• The operator symbols used are + for AND, - for NOT and , for OR.
• Any of the referred operators loses its characteristic ability if the character \
  
  
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