Web pages in Google Supplemental Result ,How to avoid?

What is Supplemental Result?

Google put less important or duplicate content pages here.
This can happen Any optimized site.Even though important pages put as  Google Supplemental
Result till it confirm the
importance of the page. So we can’t exactly say these pages are less important or
duplicate all the times.
How do I check Supplemental Result in google?
You can check Supplemental Result by typing below wording in google search box.
site:www.yourdomain.com *** -sljktf

What is the disadvantages being in Supplemental Result?
You will get very low traffic from Google since your results are not in first pages.
Your site results will show as alternative , So your site will not display for competive keywords

How to move from Supplemental Result to main index?
I have done some test with this. First If you are sure your site title description and content are unique ,don’t warry.
your site will come to normal index after sometime. For the time being build high rank back link for those pages .

If your pages/title/description lack of content, duplicate ,then you have to do on page optimization.
Make uniques title h1 tags description and content.

Most of webmasters do above things . I also did these SEO stuff. But didn’t remove from
Google Supplemental Result.When I check Google cache it was 2 months old before optimized page.
So I check the first record of the  Google Supplemental Result
using site:www.yourdomain.com *** -sljktf , and put that link into Google page rank4 site.

After 2 days that page was in the Google main index and removed from Supplemental Result.
So the main issues is after page goes to Supplemental Result , crawlers are not coming frequently
to that page , and not caching latest version .

If your lates version picked by google and still in Supplemental Result. Wait for few weeks and make
more high ranking back links .Put more unique content to that page. Thats a proven method for me.