幻を追う[maboroshiwoou] to pursue an illusion
幻影[genei] phantom
幻覚[genkaku] hallucination
幻覚剤[genkakuzai] hallucinogen
幻姿[genshi] apparition

幻視[genshi] visual hallucination
幻想[gensou] illusions
幻想劇[gensougeki] non-realistic drama
幻像[genzou] phantom

辿たどしい[tadotadoshii] with difficulty
辿りつく[tadoritsuku] to struggle on to

辿る[tadoru] to follow (road)
元を辿る[motowotadoru] to trace back to (the origins of something)