If you go to any popular book sale online sites and search for "helicopter aerodynamics" you will get a million plus results in .086 seconds. Well there are thousands of references that would hurt your head and would take a lifetime to read. You can't do it. However, If you are aspiring to obtain a US pilot certificate I suggest you only study the FAA Handbooks. Why? Because its where the written test questions come from! Also, when you take the checkride for your certificate the FAA Inspector/ Designated Pilot Examiner is required to orally examine your knowledge AND review any questions you missed (from any area) using ANY of the FAA handbooks. I do not suggest anyone debate semantics at this point. I'm not going to list them here but faa.gov has all the FAA handbooks and they are free downloads.
Well,I wish I could fly a helicopter without having to read all those tough aerodynamics..but sadly I'm not well brought up to become one..so I'm putting in my separate effort to build one....not that I'm trying to gulp every bit of theories because as you mentioned helicopter theory can't be understood fully..only the basic and more important ones I'm trying to learn..