Sphinx search doesn't always find words

[blue-eye-labs]

Hi all,

I'm having a problem with Sphinx Search where if I have a document with a title "Laser applications" and I use the command

search -i per_projects -a laser -q

I get no results yet if I use MySQL to search for

SELECT * FROM projects AS Project WHERE Project.title LIKE "%laser%";

I get two hits. This has happened for lots of other search queries for other documents. Sometimes it works really well, sometimes it doesn't.

Here's a snippet from my Sphinx.conf if it helps:

source per
{
	type			= mysql
	sql_host		= localhost
	sql_user		= user
	sql_pass		= password
	sql_db		= database
	sql_sock		= /var/run/mysqld/mysqld.sock
	sql_port		= 3306
}

source per_projects : per
{
	# For delta indexing:
	
	sql_query_pre	= REPLACE INTO sph_counter SELECT 1, MAX(Project.id) FROM projects AS Project;
	
	# indexer query

	sql_query		= SELECT Project.id, Project.title, Project.description FROM projects AS Project \
						WHERE Project.id <= (SELECT max_item_id FROM sph_counter WHERE counter_id = 1);

	# info query

	sql_query_info	= SELECT * FROM projects AS Project WHERE Project.id=$id;
}

source projects_delta : per
{
	# indexer query
	
    sql_query		= SELECT Project.id, Project.title, Project.description FROM projects AS Project \
						WHERE Project.id > (SELECT max_item_id FROM sph_counter WHERE counter_id = 1);
	
	# document info query
	
	sql_query_info	= SELECT * FROM projects AS Project WHERE Project.id=$id;
}

index per_projects
{
	source				= per_projects
	path				= /var/data/sphinx/per_projects.index
	
	morphology			= stem_en, metaphone
	min_stemming_len	= 4
	
	stopwords			= /usr/local/etc/sph_stopwords.txt
	
	min_word_len		= 3
	min_infix_len		= 3
	infix_fields		= title
	enable_star			= 1
}

index projects_delta : per_projects
{
	source			= projects_delta
	path			= /var/data/sphinx/projects_delta.index
}

searchd
{
	port			= 3312
	log				= /var/log/searchd/searchd.log
	query_log		= /var/log/searchd/query.log
	pid_file		= /var/log/searchd/searchd.pid
}

[blue-eye-labs]

Does anyone know why Sphinx is behaving like this? Maybe I have some weird config options or something? Please?