Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
pham cuu » pham huu, cham cuu, pham cua
tinh vi » trinh vi, tinh voi, tinh va
cuu ban » cuu van, cua ban, cuu san
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach thu, xach tay
dong ha » dong hoa, dong va, dong hoc
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach uu
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 ty) OR (sach tu)) ((lang xa) OR (dong ha)) hoi. hieu ve pham cuu ban tinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) ((lang xa) or (dong ha)) hoi. hieu ve pham cuu ban tinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) ((lang xa) or (dong ha)) hoi. hieu ve pham cuu ban tinh vi cua tre*.