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

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 ((lo van) OR (vo 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 ((lo van) OR (vo 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 ((lo van) OR (vo van)) thanh vi cua tre*.