Unrelated image is displayed in image search result by Japanese Katakana

Image search result display unrelated image like anime charactor when I search by Japanese Katakana word.

Sample of search result:

Japanese Katakana word: NG
"アフリカ"

English : OK
"Africa"

Katakana word sample:

Expected behavior:
Images related to search words are displayed.

This is still an issue. The result quality can currently be improved by searching with quotes to find matches for the literal search string.