Text mining

hello . I am pursuing a master's degree in business information management at Mersin University. I will share my problem in detail on the link you sent I use rapid miner program in my thesis. but I encountered two problems. I have 4500 Turkish theses and 1500 articles. 150 pages each thesis. 150 * 4500. each article is 20 pages. 1500 * 20. I want to classify them with rapid miner. But since my thesis count is high, I cannot make this classification with the rapidminer and it constantly gives errors. How can I solve this problem. my pc i5 processor is 5 gb.

My second problem is that I want to use the most frequently used words in my thesis, but when I do stem (snowball) in Turkish, different words come out as well as the words are not reserved for their suffixes. so I can't use the stem and I get a lot of words with the same meaning. I cannot advance my thesis briefly. can you help me