-

Boolean Expression

AND ( & ) AND& A & B A B &

OR ( | ) OR | A | B A B | |

NOT ( ! ) NOT ! A & ! B A B & !

google google AND AND google

google , , , , google

OR A | BOR A B A, Bgoogle A B A B

+ -

+ must be +

- must not -

, -, +, -, -

Stop List

Stop List

isthegoogle Stop List google

googleANDandAndaNdgooglegooglegoogle

-

!

! +

Google

Google Enter Google

Google Google Google

"and" Google "and"

Google Google

"http"".com,"

"+" "+" "+"

Google

Google

Google "googl" "googl*" "googler" "googlin""airline" "airlines"

PPT PDF doc

Doc

http://infotrip.ncl.edu.tw/tornado_html/nclindex.htm

http://readopac.ncl.edu.tw/cgi/searchtest

www.yahoo.com.twwww.google.com.twwww.google.com.twgais.cs.ccu.edu.twwww.ysm.com.twwww.yam.com