Separate with the blank(only one blank) or the comma(,) between the parameters
example:
ibm thinkpad
ibm,thinkpad
If content of the parameter includes blanks, can use and leave ruling(_) to replace
example:
a parameter is "ThinkPad X Series" you can search for :"ThinkPad_X_Series"
ThinkPad_X_Series
IBM ThinkPad_X_Series
IBM,ThinkPad_X_Series
