Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
tinh vi » trinh vi, tinh voi, tinh va
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, ve chat, ve chim
lang xa » lang ha, dang xay, lang van
dang xa » dang xay, dang ha, dang va
vi cua » vai cua, di cua

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 y ((dang xa) OR (lang xa)) hoi. hieu ((ve cham) or (vu cham)) cuc ban tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((dang xa) OR (lang xa)) hoi. hieu ((ve cham) OR (vu cham)) cuc ban tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((dang xa) OR (lang xa)) hoi. hieu ((ve cham) or (vu cham)) cuc ban tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((dang xa) OR (lang xa)) hoi. hieu ((ve cham) or (vu cham)) cuc ban tinh vi cua tre*.