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Case The search engine is case insensitive so the query "discharge valve" will return the same results as "Discharge Valve".
Keyword

The query, discharge valve will return all documents containing the words "discharge" and "valve". This type of search will return the same results as the Boolean "discharge" AND "valve".

Phrase

The query, "discharge valve" which will only return documents containing "discharge valve".

Boolean

The query, discharge AND NOT valve will return documents containing "discharge" but not "valve".
The query, discharge AND valve will return documents containing the words "discharge" and "valve".
The query, discharge OR valve will return documents containing "discharge" and also documents containing "valve".

Proximity

The query, discharge NEAR valve will return documents containing the word "discharge" NEAR the word "valve".

Advanced The query dis* will return all documents containing "dis" as part of a word, i.e. "Discharge", "Distance" and so on.
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