The resources that Hideki Tojo looked for when Japan attacked Southeast Asia were:
Oil and fuel.
Explanation:
The reason for this answer is very easy. In the second world war, Hideki Tojo was the Japanese army minister, therefore he had to plan all his moves very carefully. Now, by the time they were in Southeast Asia, The allies had put a block belt to prevent them from getting fuel from abroad to keep their machinery working. Therefore, he looked for Oil and fuels in southeast Asia. Because their trade routes were under ally blockade.
