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Some words are automatically ignored from searches simply because they are too common. For a complete listing of the most common words that are blocked, you can visit the
MySQL Full-Text Stopwords Listing. If you search for just the words “to” and “from”, your search will return no results because both words are ignored. If you search for “Protein to Complex” you may get results because protein and complex are both valid while “to” is simply ignored.
Try searching for less terms. For example, if you searched for +BREAST +CANCER and it returned no results, try searching for BREAST or CANCER to see if more results return. Better yet, use do an OR search. For example BREAST CANCER, which will search for papers containing BREAST or CANCER or BREAST CANCER.
Group terms together using quotes “ if you are looking for a specific phrase. For example, if you are interest in papers on protein kinase activators, rather than searching for protein kinase activator which will return papers containing 1 or more of those terms, search for “protein kinase activator” which will instead search for that exact phrase and only return papers that match.
Make sure you are using the correct spelling.
Make sure you haven't mixed Pubmed IDs in with Keyword terms. If you searched for “20634885 DIABETES” our search will automatically discard the word DIABETES and assume you meant to do a pubmed ID search. You can search for multiple pubmed ids like “20634885 20605454 20237159” or keyword terms like “DIABETES CANCER HERPES” but you can't search for both simulataneously.
If you are getting a huge number of results, try removing keywords from your search to help improve accuracy. For example, if you were looking for Kinase papers, but were not interested in Saccharomyces cerevisiae results, you could search for “Kinase -cerevisiae” or “Kinase -yeast” to retrieve more accurate matches.
Don't use invalid characters. For publication searches, the only valid characters are: english alphabet (A-Z), numbers 0-9, hyphen -, round brackets ( ), period ., underscore _, plus sign +, double quotes ”, angled brackets < >, tilde ~, forward slash /, and star *.