Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
van hoc » van hoa
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dap
va dau » va dao
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) OR (o hoi)). thien van hoc nuoc ((va dan) or (va dau)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (o hoi)). thien van hoc nuoc ((va dan) OR (va dau)) thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (o hoi)). thien van hoc nuoc ((va dan) or (va dau)) thai cua tre*".