Find information on the subject of your choice

function GoGoogle($word, $file)
{
    $h3 = "</br><h3 style=""text-align:center;background-color:blue;color:white;""> Google top page results </h3></br>"
 Add-Content $file $h3
    $urlG = 'http://www.google.com//search?q=' + $word + '&cad=h'
    $wreq = Invoke-WebRequest $urlG
    Start-Sleep -Seconds 1
    #get result links div
    $aList = $wreq.Links |where Href -ne $null |select -Property href
    foreach($a in $aList)
    {
        $a = [System.String]$a
        $dummy = ''
        for($c=2; $c -le $a.Length - 2; $c++)
        {
            $dummy += $a[$c]
        }
        $dummyStr = ''
        $dummyStr = "</br><a " + $dummy  + ">Google link</a></br>"
        Add-Content $file $dummyStr
    }
    #set back to zero
 $wreq = $null
 $div = $null
}
function GoYoutube($word, $file)
{
    $h3 = "</br><h3 style=""text-align:center;background-color:blue;color:white;""> Youtube top page video results </h3></br>"
 Add-Content $file $h3
    $urlY = 'https://www.youtube.com/results?search_query=' + $word + '+tutorial'
    Start-Sleep -Seconds 1
    #get result links div
    $wreq = Invoke-WebRequest $urlY
    $aList =  $wreq.Links |where title -match $word |select -Property href
    foreach($aLink in $aList)
    {
       $a = [System.String]$aLink
       $a = $a.Insert($a.IndexOf("=") + 1, "http://youtube.com")
       $dummy = ''
       for($c=7; $c -le $a.Length - 2; $c++)
       {
            $dummy += $a[$c]
       }
       $dummy = "</br><a href=""{0}"">Youtube video link</a></br>" -f $dummy
       Add-Content $file $dummy
    }
    #set back to zero
 $wreq = $null
 $ol = $null
}
$date = Get-Date
$date = "{0:dd_MM_yyyy}" -f [datetime]$date
$file = 'C:\Users\evgeni.kostadinov\Desktop\webCrawlers\3-webResources\all\results-Google-Youtube-' + $date + '.html'
$db = Get-Content 'C:\Users\evgeni.kostadinov\Desktop\webCrawlers\techsData.txt'
for($k = 0; $k -le $db.Length - 1; $k++)
{
    $searchKeyword = $db[$k]
    $h1 = "<h1 style=""text-align:center;background-color:red;color:white;""> " + $searchKeyword + "</h1>"
 Add-Content $file $h1
    #GoGoogle -word $searchKeyword -file $file
    GoYoutube -word $searchKeyword -file $file
}
start chrome $file