I found that in some cases the Baidu search engine can reveal nice filtering effects that can eliminate unnecessary search results more sharply. In one case, I was able to get enough search results by using only Baidu, while other search engines can’t eliminate extravagant unnecessary search results. This may be concerned with the characteristics of Japanese language. Japanese words are mixtures of Kanji, Hiragana and Katakana characters. In some situation Japanese people avoid using Kanji and exchange Kanji words for the Hiragana expression on purpose. Such frequently-Hiraganized words may be difficult to discriminate from other Japanese Hiragana particles in the process of search engine algorithms. That can be one of the reasons of low sharpness of the word-filtering. Baidu search engine seems to be advanced a little in this point. Perhaps they have to solve the problem that the permutation of each Kanji characters can have every different meanings in the sentences written in Chinese. For Japan the evaluation of frequencies of Hiraganizing or Katakanizing is indispensable for creating good search algorithms.
(Above illustration is from the CD attached to the Book 'Selections from figured paper in Kyoto and Japanese patterns' published by Impress Japan.)
