You can use as search criteria:

Words: To search for multiple words, separate them with spaces.

Phrases: To search for an exact phrase, surround it with double or single quotation marks. A string of capitalized words is assumed to be a name. Separate a series of names with commas. Commas aren't needed when the phrases are surrounded by quotation marks.
The following example searches for a document that contains the phrases "European Maritime" and "Oil Pollution": "European Maritime" "Oil Pollution"

Plain language: To search with plain language, enter a question or concept. The Internet Query Parser identifies the important words and searches for them.
For example, enter a question such as: Where is the EMSA in Lisbon? This query produces the same results as entering: EMSA Lisbon

Including and excluding search terms: You can limit searches by excluding or requiring search terms, or by limiting the areas of the document that are searched.
A minus sign (-) immediately preceding a search term (word or phrase) excludes documents containing the term.
A plus sign (+) immediately preceding a search term (word or phrase) means returned documents are guaranteed to contain the term.

Query syntax: The query syntax is very similar to the syntax that users expect to use on the web. Queries are interpreted according to the following rules:
- Individual search terms are separated by whitespace characters, such as a space, tab, or comma; for example: EMSA regulation
- Search phrases are entered within double-quotation marks; for example: "European Maritime" regulation
- Exclude terms with the negation operator, minus ( - ), or the NOT operator; for example: EMSA regulation -portugal is the same as EMSA regulation NOT portugal
- Require a compulsory term with the unary inclusion operator, plus sign (+); in this example, the term portugal must be included: EMSA regulation +portugal
- Require compulsory terms with the binary inclusion operator AND; in this example, the terms regulation and portugal must be included: EMSA regulation AND portugal

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