Here is a good, basic formula for getting started with your research:
Use phrase searching when word order is important.
- "iron curtain"
- "musical union"
Use * to substitute for 1-5 characters. Use ** to substitute for truncation of any number of characters. Use ? to substitute for a single character.
- dmit** shosta** (Dmitri Shostakovich)
Use "AND" to search ALL words. Use "OR" to search ANY single word. Use "NOT" to exclude words. Use parentheses to group similar words.
- (zooplankton OR crustacea*) AND
(marine OR ocean** OR sea)
- environmental policy NOT united states