Use phrases
e.g. indoor air quality

For AND use &
e.g.office & ergonomics

For OR use /
e.g. pesticides / herbicides

For NOT use !
e.g. agriculture ! forestry

To truncate use *
e.g. disab* (to will find disable, disabled, disability, disabilities etc)

Use >, <, = to search years.
e.g. >1999

Use : between dates to search a range of dates.
e.g. 1999 : 2003