Most systems ignore stopwords, single letters and digits, etc.
- When stopwords, letters and digits or other symbols are not stored
in an index database it becomes difficult to find certain types of
information, such as chemical formulae and names like C, C++ and X.
- Ignoring stopwords also makes it difficult to find names containing
them, like "de Bra".
- Searching for adjacent words or phrases is also disturbed by ignoring
stopwords. Searching for "light blue" may match "light and blue"
because the "and" cannot be traced in the database.
