Select Candidates With More Than One Skill (was Help Required)

I am struggling with a query and need urgent help.

I have a table with fields

canid
skillLevel
percent
date

and example of the results wud be

canid skillLevel Percent Date
704 1 20 n/a
705 2 10 n/a
775 1 50 n/a


what i want to do is produce a query that would return a result from the following search critera

return all results that match

skilllevel 1 and 20 percent AND skillLevel 2 and 10 percent

I tried this below but obviously im doing something wrong

select * from simulatedHistory where
((skilllevel = 1 and percent = 20) And (skilllevel = 2 and percent = 10))


I need the query returning

canid skillLevel Percent Date
704 1 20 n/a
705 2 10 n/a

any suggestions??? any help wud be much appreciated