"Mo okou" - "For you all". "Mo" is "For"; "okou" is "you". "Oe" is "You" (singular"; "Okou" is "you" (plural). It would be better to add "all" to clarify that it's not just one person involved. If you say "Mo oulua", the translation is "For you two". "Oulua" refers to two people. "Okou" also should be "oukou". "Okou" is spoken form only. You tend to drop the "u" when you speak, but the correct word should be "oukou" (referring to more than two people).
"For" (mo)
Fa'afetai mo mea uma
Fa'afetai mo mea uma
Fa'afetai mo le fa'aopo'opo.
The Samoan translation for "wait for me" is "fa'amalie atu ia te a'u".
if you speak Samoan read this O loo i ai se feau mo oe
O le a ou fa'atali mo oe
Blessing to you all = Fa'amanuiaga mo outou uma.
"Le fusi alofa lenei mo oe"
Fa'aauau pea le tatalo mo a'u.
Molimau mo le Atua
Talosia/kalosia = pray for, eg "Pray for us" = "Talosia mai i matou" or "Tatalo mai mo i matou". Tatalo is also pray and prayer.