Perhaps you should try some spelling variations:
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
dinh de » dinh ve, dinh du, dinh le
y nang » ky nang, ly nang, v nang
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 y nang ((mai 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 y nang ((mai 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 y nang ((mai hoi) or (xa hoi)). hieu ve cac ((xuc va) or (duc va)) dinh de cua te*.