I have website named knoxandstandrews.multiply.com. SometimesI find this site at google.ca Sometimes not why?

As I wrote, I want to see my website through search web, such as google.com or ca or yahoo.ca or com. When I type knox presbyterian church glenarm and St. Andrew's fenelon falls at these search engines I sometimes find my website through these. Most of the times I can not find it. I wonder why I can not find my site all the time. One of my guess is that my site does not have a lot of html stuff. This site works with multiply.com. Is that the reason people cannot search my website through search engines. Is there anybody who has simliar problems? Is there anybody who can help me? If you have time, type www.knoxandstandrews.multiply.com and look at the site. After that, go to google.com or ca and type key words, such as knox glenarm and st. andrew's fenelon falls and/or caleb kim. You may be able to find my website at the tope of the results. You may not. I have tried to find my site as I wrote a number of times. Sometimes I find it. Most of the times I could not find it. Why?