The Family History Library has many Samoan Oral Genealogies.
For additional oral genealogies go to labs.familysearch.org. Go to Community Trees. Go to Oral Genealogies and click on Samoa.
Search in the FamilySearch Wiki using these phrase: "Pacific Island Guide to Family History Research". Go to step 9: Obtain and search records. This is lead you to an important collection known as the Cole-Jensen Collection on microfilms 1358001-1358009 as well as other collections.
Also search the Wiki for Samoan, Tongan and other Polynesian genealogies.