How can my site not ranked on easy keyword while it currently ranked 1 on difficult keyword??

[IKT]

The site in question is http://ikt.co.id

The site is perfectly optimized (or even over optimized) for keyword "Bikin Website Murah" (in Indonesia it means "develop an affordable website")

currently if you search on both google.co.id AND google.com, it ranked on #10 (on google.co.id) and it ranked on #7 (on google.com), and both term only return 1.3 million results

I have A LOT OF pages that started with 'bikin website' , or 'website murah' ... there are a lot of them, and i have had a lot of backlinks on those pages too (have been manually building a lot of links, starting from creating a tutorial article and blog submission and many other way) .. the site has been perfectly optimized for that keyword

For example we have

http://ikt.co.id/blog-category/bikin-website-murah-promo-terbaru.html (for newest promotion)

http://ikt.co.id/blog/bikin-website-seo-murah-discount-40-sampai-31-juli-2011.html (for discount 40% promo that lasted untill 31 juli 2011)

AND YET, if you search on google.co.id for keyword "2000 likes facebook" , our lone page that i created when our facebook likes reached that amount, RANKED #1!! , and please let me tell you this term return 400 million results++ (on google.com this keyword ranked #19, on 500 million results++). And let me tell you it take that SINGLE page (which has absolutely 0 backlinks) 2 days to ranked #1 .... and her brother if you searched "1000 likes facebook" also show similar result (though not better then the sister)

How ?!? and Why ?!? , i dont understand this at all.... my domain does not contain any keyword, they uses the same engine and yet that lone pages which have absolutely no backlink ranked so well on a very competitive keyword, while my Target Keyword ranked poorly....

And what is even more bizzare?

"Bikin website murah" might not rank good, but "bikin website" ranked better x_x ... arghh i dont get it... why my site ranked poorly on easy keywords and ranked high on difficult keywords :(( ....

Why I am not smiling because those easy keyword is actually my primary keywords

[IKT]

I uses the SEOMOZ Tool Keyword difficulty to check this up

"BIKIN WEBSITE MURAH" , 40% difficulty , i ranked #10

"BIKIN WEBSITE" , 40% difficulty too but returned much more results, i ranked #5

how can the 2 words keyword perform better then the 3 words keyword?? and those 2 words keyword "bikin website" on my site ALWAYS have the last word "murah" behind them... so it is always "bikin website murah xxx" , or "bikin website seo murah" ... and there also "bikin website murah promo" , so how can the 2 words keyword which return a lot more results perform better then the 3 words keyword ??