i dont understand google please help

1 year ago have backorder a domain who have 150 backlink

i have write unique product description on all page
but the site is always no ranking
rank only for very low keyword of some product pages

and for home page i see only ranking
if i tape on google product name + price of product
when i tape that on google i rank number 1
but if i tape only product name i not see my shop

what the problem do add some articles?

Ranking is totally different than indexing. You can see your website rank for very low keyword, because it has no competition.

But when it comes to huge competition keyword, your website cannot be shown, this is because, your website popularity in google. Ranking does not only depend on original article, it depends on number of backlinks to that page, and how relevant information, and how important it is.

You need to do on page seo perfectly, so google will index and rank better at start. Get your page backlinks more and more.

the website have a lot of backlink already
for keyword i need to rank

What kind of back-links are they? d0f0ll0w or n0f0ll0w (I think this is the case for 95% or more of those -- too bad for ranking your page for the keyword involved)? That's the first thing you should look at.

What are the anchor-texts?

Where are these back-links coming from (I think they are just some mixed up links, not too important and too many less than PR-3~3+ pages)?

Do they come from same niche, higher authority (I doubt)? This applies to both the OBL's & the IBL's on those pages...

How many OBL's on the pages that are sending you those back-links (I think there are too many)?

What kind of IBL's on those pages (none or low-quality, I guess)?

What about the content on your site? Would targeted-visitors stay more than few moments on your pages?

There can be many more factors involved.