Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thien van » thi van
tu sach » thu sach, su sach, te sach
dac ban » cac ban, dac san, duc ban
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
sach lo » sach dao, sach doi, sach hoi
van cac » van hac, van cau, van bac
lo nang » ho nang, ly nang, loai nang
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, 5 hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo nang ((x hoi) OR (x ho)). thien van cac ((dac ban) OR (dua ban)) thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo nang ((x hoi) OR (x ho)). thien van cac ((dac ban) or (dua ban)) thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang ((x hoi) OR (x ho)). thien van cac ((dac ban) or (dua ban)) thanh vai cua tre*.