just remember the common radicals.

烋 is with 灬 （四点水） http://www.zdic.net/zd/jtbs/ZdicE7Zdic81ZdicAC.htm

想 is with 心 （心字底） http://www.zdic.net/zd/jtbs/ZdicE5ZdicBFZdic83.htm

they are both very commmon radicals  .

lookup radicals at http://www.zdic.net/zd/bs/

for your latter question. I think you could look for the less stroke one. but the situation which both parts are radical is rare.

e.g. you can find 贾 with '贝' radical but not in '西' radical in http://www.zdic.net/zd/bs/

Just remember the common radicals:

• 烋 is with 灬 （四点水）
• 想 is with 心 （心字底）

They are both very commmon radicals. You can look up radicals at the zdic.net site.

Concerning your latter question, I think you could look for the less stroke one; but the situation which both parts are radical is rare.

e.g. you can find 贾 with '贝' radical but not in '西' radical in the site I linked above.

just remember the common radicals.

烋 is with 灬 （四点水） http://www.zdic.net/zd/jtbs/ZdicE7Zdic81ZdicAC.htm

想 is with 心 （心字底） http://www.zdic.net/zd/jtbs/ZdicE5ZdicBFZdic83.htm

they are both very commmon radicals .

lookup radicals at http://www.zdic.net/zd/bs/

for your latter question. I think you could look for the less stroke one.

e.g. you can find 贾 with '贝' radical but not in '西' radical

just remember the common radicals.

烋 is with 灬 （四点水） http://www.zdic.net/zd/jtbs/ZdicE7Zdic81ZdicAC.htm

想 is with 心 （心字底） http://www.zdic.net/zd/jtbs/ZdicE5ZdicBFZdic83.htm

they are both very commmon radicals .

lookup radicals at http://www.zdic.net/zd/bs/

for your latter question. I think you could look for the less stroke one. but the situation which both parts are radical is rare.

e.g. you can find 贾 with '贝' radical but not in '西' radical in http://www.zdic.net/zd/bs/