Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
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 (thien van)) cao duc va tinh co cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (o hoi)). ((hieu qua) OR (thien 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 (thien van)) cao duc va tinh co cua te*.