Perhaps you should try some spelling variations:
su sach » so sach
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va dinh » van dinh, va kinh, va tinh
dinh le » dinh ve, dinh ly, dinh ket
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
le cua » ly 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) or (vu sach)) y nang ((ma hoi) or (xa hoi)). hieu va cac duc va dinh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ((ma hoi) OR (xa hoi)). hieu va cac duc va dinh le cua te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ((ma hoi) or (xa hoi)). hieu va cac duc va dinh le cua te*.