If, as stated in the comments, you're targeting a page such as http://www.amazon.com/s/ref=nb_sb_ss_i_0_5?url=search-alias%3Daps&field-keywords=radio&sprefix=radio%2Caps%2C182 to try to get all item names, then the following code:

HtmlDocument doc = new HtmlDocument();
doc.Load(myHtmlFile);

foreach (HtmlNode node in doc.DocumentNode.SelectNodes("//span[@class='lrg bold']"))
{
    Console.WriteLine(node.InnerHtml);
}

will output this:

Sony ICF-S10MK2 Pocket AM/FM Radio, Silver
Ambient Weather WR-111A Emergency Solar Hand Crank AM/FM/NOAA Digital Radio, Flashlight, Cell Phone Charger with NOAA Certified Weather Alert & Cables
Sony ICF38 Portable AM/FM Radio (Black)
Coby CX39 World Band AM/FM/Shortwave Radio with Digital Display, Silver
Radio
Sony ICF-C318 Clock Radio with Dual Alarm (Black)
Sony Icf38 Portable Am Fm Radio Led Tuning Indicator Lg Spkr
TuneIn Radio
Sangean WR-2 Digital AM/FM Tabletop Radio, Walnut
SANGEAN WR-11 AM/FM Table Top Radio
Crosley Solo Radio CR221 Black
Sony ICF-C218 Automatic Time Set Clock Radio (Black)
Coby CXCD251BLK Portable CD Player with AM/FM Radio, Black
Sony ICFC414 Clock Radio
Radio
Panasonic RF-P50 Pocket AM/FM Radio, Silver

The XPATH expression will just get all SPAN elements that have a CLASS attribute set to 'lrg bold'. To find that, I just looked at the saved version of the HTML and determined a good discriminant for the item names.

I suggest you learn a bit of XPATH, as it's very powerful. A good tutorial is here: XPATH Tutorial