Large Companies Taking Over Rankings

[totalvac]

Recently many large companies. (lowes, bed bath and beyond, walmart, target, ace hardware, etc.),  have taken over the rankings of keywords we used to rank high in. Is there any way to improve our rankings and compete with these large companies? Is this due to recent Google changes?

Sample keywords are: electrolux vacuum bags, oreck vacuum bags, vacuum cleaner bag, vacuum cleaner filter

[EGOL]

lowes, bed bath and beyond, walmart, target, ace hardware...

Yes, just in the past month, some of these big brands and others have moved strongly into my SERPs.

Is this due to recent Google changes?

YES.  Google is favoring them.

** Is there any way to improve our rankings and compete with these large companies? **

I have a whole website about a single product niche, with more information about these products than all competitors combined, yet google ranks these companies when they have one cheap, low-quality product from the niche.

I am killing the big brands on all of the long tail, but they are really strong in the head terms.

Keep hammering!  Attack the long tail.  Saturate it with good content.  Make your site the information place for these products.  The people at walmart and other big brands can't answer questions about these products.  They know nothing about them.  Lots of people will be from you because they know that you are informed about these products and can help them.  Walmart knows nothing and is worthless for help.

[AWCthreads]

We compete against those box stores and do really well in the local serps for long and some head terms.

I don't know if local applies, but there are battles in that space to win.