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Don't confuse AND and OR. A search for india & china & kenya probably won't find any records, but india / china / kenya will. Why? Because the first search (using &) requires that each record contain all three words. The second search (using /) requests any record containing any of those words.
We strongly recommend that you structure your search using sets. These allow you to combine symbols in a box by using round-brackets to control the order of evaluation (without round brackets, the conditions are evaluated in left-to-right order, which can cause unexpected results).
For example:
You can include or omit spaces around the Boolean symbols (& / !).
To carry out a keyword search, type the keyword in the first search box. You can truncate a word using * to widen your search criteria, for example medic* will search for medical, medicine, medication etc.
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