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