Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((hieu ve) or (lieu va)) cau ((tuc va) or (hoc va)) thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu ve) OR (lieu va)) cau ((tuc va) OR (hoc va)) thanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu ve) or (lieu va)) cau ((tuc va) or (hoc va)) thanh doi cua tre*.