Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
tang ma » tang van
lo van » le van, vo van, so van
vi cua » vai cua, di cua
ve cam » ve cac, va cam, ve cai

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 ky ((mang may) OR (tang ma)) hoi. hieu ((ve cam) OR (ve cham)) lo van thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang may) or (tang ma)) hoi. hieu ((ve cam) OR (ve cham)) lo van thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang may) or (tang ma)) hoi. hieu ((ve cam) OR (ve cham)) lo van thanh vi cua tre*.