sql server 多条件查询话语 出错

sql server 多条件查询语句 出错
@QuestionParentDirection nvarchar(50)=null,
@QuestionChildDirection nvarchar(50)=null,
@QuestionStyle nvarchar(20)=null,
@SourceCompany nvarchar(50)=null,
@QuestionDateA nvarchar(10)=null,
@QuestionDateB nvarchar(10)=null,
@KeyWord nvarchar(50)=null

AS
SELECT QuestionParentDirection,QuestionChildDirection, QuestionStyle, QuestionTitle, QuestionAnswer, SourceCompany, QuestionDate
FROM Question
WHERE(Visibility = 1) 
AND (@QuestionParentDirection is null or RTRIM(QuestionParentDirection) = @QuestionParentDirection)
AND (@QuestionChildDirection is null or RTRIM(QuestionChildDirection)=@QuestionChildDirection) 
AND (@QuestionStyle is null or RTRIM(QuestionStyle) = @QuestionStyle)
AND (@KeyWord is null or (RTRIM(QuestionAnswer) like '%'+@KeyWord+'%' or RTRIM(QuestionTitle) like '%'+@KeyWord+'%'))  
AND (@SourceCompany is null or RTRIM(SourceCompany) = @SourceCompany) 
AND (QuestionDate BETWEEN @QuestionDateA AND @QuestionDateB)
为什么有的语句执行不了呢，没有报错，但是查询不到结果，请大神看看哪不对

[解决办法]
晕，你就给堆代码要人看，业务也不知道，怎么搞啊，你把where中的每个and条件，逐个注销，看看是哪个导致没数据的，语法上没错误。应该就是你的条件没选对或者数据有问题而已

SQL code

SELECT  QuestionParentDirection ,         QuestionChildDirection ,         QuestionStyle ,         QuestionTitle ,         QuestionAnswer ,         SourceCompany ,         QuestionDate FROM    Question WHERE   ( Visibility = 1 )         AND ( @QuestionParentDirection IS NULL               OR RTRIM(QuestionParentDirection) = @QuestionParentDirection             )         AND ( @QuestionChildDirection IS NULL               OR RTRIM(QuestionChildDirection) = @QuestionChildDirection             )         AND ( @QuestionStyle IS NULL               OR RTRIM(QuestionStyle) = @QuestionStyle             )         AND ( @KeyWord IS NULL               OR ( RTRIM(QuestionAnswer) LIKE '%' + @KeyWord + '%'                    OR RTRIM(QuestionTitle) LIKE '%' + @KeyWord + '%'                  )             )         AND ( @SourceCompany IS NULL               OR RTRIM(SourceCompany) = @SourceCompany             )         AND ( QuestionDate BETWEEN @QuestionDateA                            AND     @QuestionDateB )
[解决办法]
从最内部的联接查询，或者说从最初的联接查询开始，一步一步看是否有数据。