(The system limit is 7.) A query that is too complex will usually result in few if any hits. Try to keep your query to no more than 3 or 4 distinct concepts. Avoid long, complex queries as with all databases, simpler is usually better.Example: 'lead content in paint (pigments, coatings)'. In place of the OR operator, you can include synonyms or alternate terms in parentheses, separated by commas, following the word in question.SciFinder does not use Boolean operators in a conventional way.You can get around this somewhat by selecting the more restrictive 'as entered' option in the results table. For example, 'determination of arsenic' is processed the same way as 'determination in arsenic' even though the two phrases mean different things to a chemist. Connector words are not searchable terms, nor are they analyzed for their linguistic meaning. SciFinder uses connectors (also known as stopwords: AN, AND, AS, AT, BY, FOR, FROM, IN, OF, ON, OR, THE, TO, and WITH) to parse a query into component concepts.single walled carbon nanotubes in thin film transistors.Compose a natural-language query phrase with at least two distinct concepts, linked with connecting words.

Here is a short list of important searching points unique to SciFinder. This can sometimes cause frustration when you're trying to isolate records very carefully. It is not designed to be a highly precise search tool for expert searchers. SciFinder's topic search was designed to maximize retrieval, so some of its imprecision is intentional. SciFinder uses a proprietary, complex (and somewhat mysterious) natural language query algorithm that breaks your query into a set of discrete concepts, searches them against the database indexes, and then presents you with a selection of result options. The Explore by Research Topic option presents a single text box that looks like Google's, but SciFinder's search algorithm functions very differently from those of standard web search-engines.

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