kMDItemContentType == "com.microsoft.word.doc" || 
kMDItemContentType == "org.openxmlformats.wordprocessingml.document" 

Query format

inRange(attributeName,minValue,maxValue)

c The Comparison is case insensitive.  
d The Comparison is insensitive to diacritical marks.
w The Comparison is word based, and also detects transitions from lower-case to upper-case

"Paris"   Matches Paris, but not paris nor "I love Paris".  
"Paris"c  Matches Paris, paris, but not "I love Paris".
"Paris"wc Matches Paris, paris, "I love Paris", paris-france.jpg, but not Comparison.
"Window"w Matches MyWindowClass and "Broken Window", but not NSWindow.

*paris* 

$time.now current date and time.  
$time.today current date.
$time.yesterday Yesterdays date.
$time.last_week Dates in previous week.
$time.this_week 
$time.this_month 
$time.this_year 
$time.now(seconds) current time +  [-]seconds
$time.today(days)   the current day + [-]days
$time.this_week(weeks) current week …
$time.this_month(month) current month …
$time.this_year(years) 
$time.iso(ISO-8601-STR) 

((kMDItemAuthors == "Kevin"wc || kMDItemAuthors = "Steve"wc) && 
 (kMDItemContentType == "audio"wc || kMDItemContentType = "video"wc)) && 
 (kMDItemFSContentChangeDate > $time.last_week)




Common kMDItem…s

Comment
ContactKeywords

Audiences
Authors
Contributors 
PhoneNumbers
EmailAddresses
InstantMessageAddress
Copyright
Creator
Publishers
ContactCredit
FinderComment
Coverage
Description
Title
Version
DisplayName
DueDate
DurationSeconds
EncodingApplication
Fonts


Organizations
City
StateOrProvince
Country
Languages
Headline
Identifier
Keywords
Instructions
Kind
NumberOfPages
PageHeight
    Width


AttributeChangeDate
LastUsedDate
ModificationDate
 Type
Projects
Recipients
Rights
SecurityMethod
StarRating
TextContent
WhereFroms
Image
AcquistionMake¿
Model
Album
ProfileName
BitsPerSample
ColorSpace
EXIFVersion
ExposureMode
 Program
 TimeSeconds
     String
Aperature
Fnumber
FlashOnOff
FocalLength

HasAlphaChannel
ISOSpeeed
LayerNames
MaxAperature
MeteringMode
Orientation
PixelHeight
 Width
RedEyeOnOff
ResolutionHeightDPI
 WeidthDPI
WhiteBalance

Video 
AudioBitRate
Codecs
DeliveryType
MediaTypes
Streamable
TotalBitRate
VideoBitRate
Audio 
AppleLoopDescriptors
         sKeyFilterType
          LoopMode
          RootKey
AudioChannelCount
     EncodingApplication
     SampleRate
     TrackNumber
Composer
IsGeneralMIDISequence
KeySignature
Lyricist
MusicalGenre
       InstrumentCategory
                 Namke
RecordingDate
         Year
Tempo
TimeSignature

File System 
FSContentChangeDate
  CreationDate
  Invisible
  IsExtensionHidden
  Label
  Name
  NodeCount
  OwnerUserID
  OwnerGroupId
  Size
Path