Hi gang!!! i have tried everything, did my homework, and now i need your help, ohhh the wise ones

i am downloading some scanned pdf with some technical articles i need for work, and when i tried to open them in the iphone they just show the images (pics illustrations etc,) but no text at all, i have tried rubooks, pdfviewer, wildeyes, safari and i always get the same result: blanks blanks blanks, illustrations, blanks blanks,

what is going on???

help, i feel it would be like heaven to read those articles while conmuting to work and not to carry the lap