Search function

Hello,
When I search using this key: +laptop +power about 1101 results are being returned. When I try to refine that result and enter a new search key +laptop +power +sys, I get exactly the same results, that is, not restricted to results which include sys as well. Why is that?
jlinkels
PS. When I am searching for something for which I don' t exactly know what key yields the best results, and hence I repeat some searches one quick after another often I receive a message: Search is not possible now, please try again in a few minutes. Is there a minimum time between searches? For a registered member? Do you really prefer people posting even if the answer can readily be found because 3 searches in a minute are too much?
When I search using this key: +laptop +power about 1101 results are being returned. When I try to refine that result and enter a new search key +laptop +power +sys, I get exactly the same results, that is, not restricted to results which include sys as well. Why is that?
jlinkels
PS. When I am searching for something for which I don' t exactly know what key yields the best results, and hence I repeat some searches one quick after another often I receive a message: Search is not possible now, please try again in a few minutes. Is there a minimum time between searches? For a registered member? Do you really prefer people posting even if the answer can readily be found because 3 searches in a minute are too much?