There must be dozens if not hundreds of reasons you can't find a passenger record. I've learned the hard way how tricky passenger records can be.
My maternal great-grandmother Dora Zarov sailed with 2 children at the end of 1904. The handwritten entry for the family surname reads Barow. It was corrected in another hand with a Z overwriting the B. But modern transcribers recorded her name as Iora Barow, ensuring that no amount of clever searching, sound-like, etc., for either name would locate her record. I lucked out only because there was another Zarov family on the same ship and their entry is written and transcribed correctly, appearing just below Dora's.
In a different twist, paternal great-grandfather Mendel Sztejnsapir traveled under a different name. His naturalization petition included the wrong date and name of the ship. A friend found the record by sifting through thousands of lines of manifest records looking for single males in Mendel's age range. M. Sapier? Bingo.
I chalk up my many remaining brick walls, records I'm sure must be there but I haven't located, to similar glitches. Sometimes you get lucky. Sometimes it's a matter of dogged persistence. Sometimes luck or persistence is not enough to overcome some brick walls.
Lee David Jaffe
Surnames / Towns: Jaffe / Suchowola, Poland ; Stein (Sztejnsapir) / Bialystok and Rajgrod, Poland ; Joroff (Jaroff, Zarov) / Chernigov, Ukraine ; Schwartz (Schwarzman?, Schwarzstein?) / ? ; Koshkin / Snovsk, Ukraine ; Rappoport / ? ; Braun / Wizajny, Suwalki, Poland, Ludwinowski / Wizajny, Suwalki, Poland