Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban tinh » ban thanh, quan tinh, ban hanh
cham cuc » cham cuu, pham cuc, pham chuc
hieu ve » hieu va, hieu van
tinh va » tich va, trinh van, trinh vat
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu su, dieu vu
dong ha » dong hoa, dong va, dong hoc
dang xa » dang xay, lang xa, dang ha
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((dang xa) or (dong ha)) hoi. ((hieu vu) or (hieu ve)) cham cuc ban tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((dang xa) OR (dong ha)) hoi. ((hieu vu) OR (hieu ve)) cham cuc ban tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((dang xa) or (dong ha)) hoi. ((hieu vu) or (hieu ve)) cham cuc ban tinh va cua tre*.