If you are finding it difficult to get the information you want on wheelchairs, it may be because the webmaster who has written the page did not use an appropriate meta tag. The subject that you are looking for is listed by the search engine according to the relevance of the particular subject to the web page.
If the site is a wheelchairs website then the webmaster needs to design it properly. To make it easier for the search engine to evaluate the page the site should have wheelchairs listed in a key-word meta tab. This in important so the search engine can determine the importance of wheelchairs in the website.