Perhaps you should try some spelling variations:
child information » chief information, china information, world information
irrigation system » irrigation systems, irrigation water, irrigation scheme
chuan irrigation » change irrigation, canal irrigation, indian irrigation
support child » support build, report child
support chuan » support can

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( support child information theory. ) OR ( support chuan irrigation system. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support child information theory. ) or ( support chuan irrigation system. ))*.