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 ca » tinh cao, tinh cua, tinh va
y nang » ky nang, ly nang, v nang
ca cua » co cua
cua te » cua tu
x hoi » xa hoi, o hoi, 5 hoi

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 (x ho)). ((hieu qua) or (thien van)) cao duc va tinh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). ((hieu qua) OR (thien van)) cao duc va tinh ca cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (x ho)). ((hieu qua) or (thien van)) cao duc va tinh ca cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (x ho)). ((hieu qua) or (thien van)) cao duc va tinh ca cua te*.