Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
thi van » thi lan, thi hanh, thi nang
cao duc » dao duc, cao suc, giao duc
va tinh » may tinh
tinh co » trinh co, tinh cao, tinh cho
y nang » ky nang, ly nang, v nang
co cua » con cua, ca cua, cong cua
cua te » cua tu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((x hoi) or (o hoi)). ((hieu qua) or (thi van)) cao duc va tinh co cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (o hoi)). ((hieu qua) OR (thi van)) cao duc va tinh co cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (o hoi)). ((hieu qua) or (thi van)) cao duc va tinh co cua te*.