Let's take a look through your introduction.
"It is argued by some people that scientific investigation is conducted and controlled by individual institutions not as effective as government."
This sentence is ungrammatical and somewhat wordy. In addition, "individual" and "private' are not the same. "individual institutions" refers to ones that are not related to each other, whereas "private institutions" refers to ones that are operated by a person or a group of people rather than by the government. You would want to say:
"Some people argue that scientific investigation conducted by private institutions is not as effective as by the government."
You can say either "the government" or "governments", but you can never say "government". By the way, consider using active voice wherever possible.
The other: "I completely disagree with this argument, I believes that co-operation among government and private enterprises to be the best way to develop science-related study."
Again, this sentence is ungrammatical. Moreover, this sentence has two main clauses, which means there needs to be a conjunction. Another solution is to split the sentence into two sentences as follows:
I completely disagree with this argument. I believe that co-operation among governments and private enterprises is the best way to develop science-related study."