How to create a dynamic search expression

Summary

I have a custom object and there are some custom fields in it. From a standard object, I want to search record in this custom object dynamically.

Content

HI All,

I have a custom object and there are some custom fields in it. From a standard object, I want to search record in this custom object.

 

Here is the details of my custom object:

Object Name: ObjectFieldVal

Object API Name: ObjectFieldVal_c

Custom Fields:

        Name                          API Name                      Value

a.    ObjectName               ObjectName_c                Contact

b.    FieldName                 FieldName_c                   Name

 

Here are the queries I’ve tried:

I. First Expression

a) Multiple search expression