xīxué
сисюе
си1 сюе2
http://www.chinese-russian.com/zd/ci/56981
http://www.chinese-russian.com/zd/ci/191698
xǐxuē
си3 сюе1
http://www.chinese-russian.com/zd/ci/160575
xǐxuě
си3 сюе3
http://www.chinese-russian.com/zd/ci/160677