Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lai hoi » dai hoi, lai hoa, lai roi
hieu ve » hieu va, hieu van
dinh de » dinh ve, dinh du, dinh le
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
de cua » le cua, te cua, dieu cua
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((lai hoi) or (xa hoi)). hieu ve cac ((xuc va) or (duc va)) dinh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((lai hoi) OR (xa hoi)). hieu ve cac ((xuc va) OR (duc va)) dinh de cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((lai hoi) or (xa hoi)). hieu ve cac ((xuc va) or (duc va)) dinh de cua te*.