Search in new Sitecore ContentSearch using whole words - search

Question

I am using new Sitecore search, and the issue I ran into is having results come for words that have nothing to do with my search term.
For example, searching for "lies" will find "applies". And this is not what I am looking for.
This is an example of search I am doing (simplified). It is a direct LINQ check for "Contains" on the "Content" property of the SearchResultItem, and most likely not what I supposed to do. It is just happen to be that samples I find online are practically doing so.
Example of my code (simplified). In here I break down the search sentence to separate keywords. By the way, I am looking for a way to show full sentence match first.
using (var context = ContentSearchManager.GetIndex("sitecore_web_index").CreateSearchContext())
{
var results = context.GetQueryable<SearchResultItem>()
.Filter(i => i.Path.StartsWith(Home.Paths.FullPath))
.Filter(GetTermPredicate(Term));
// use results here
}
protected Expression<Func<SearchResultItem, bool>> GetTermPredicate(string term)
{
var predicate = PredicateBuilder.True<SearchResultItem>();
foreach (var tempTerm in term.Split(' '))
{
predicate = predicate.And(p => p.Content.Contains(tempTerm));
}
return predicate;
}
Thank you in advance!!

Answer 1

All right. I got help from Sitecore Support.
In my version of Sitecore I can use the following to acheive search for a whole word instead of partial:
instead of:
predicate = predicate.And(p => p.Content.Contains(tempTerm));
use
predicate = predicate.And(p => p.Content.Equals(tempTerm));
Issue solved.

Answer 2

Replace Filter in your code by Where, it should be fine,
here is an example :
var currentIndex = ContentSearchManager.GetIndex("sitecore_web_index");
using (var context = currentIndex.CreateSearchContext())
{
var predicate = PredicateBuilder.True();
foreach (var currentWord in term.Split(‘ ‘))
{
predicate = predicate.Or(x => x.Content.Contains(currentWord ));
}
var results = context.GetQueryable().Where(predicate).GetResults();
}

Answer 3

As Ahmed notes, you should use Where instead of Filter, since Filter has no effect on search rank. The classic use case for filters is to apply a facet chosen by the user without distorting the ordering of results, as would happen if you used a Where clause.
Filtering is similar to using Where to restrict the result list. Both methods will affect the result in the same
result list, but when you use a Filter the scoring/ranking of the search hits is not affected by the filters.
Developer's Guide to Item Buckets and Search
There's a good dicussion of when to use Filter on the Sitecore 7 team blog:
Making Good Part 4: Filters, Paging and I'm feeling lucky.

Answer 4

If you only want to search for whole words, you could prefix and postfix the searchterm with a space. Allthough this doesn't catch all situations.