Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van thanh » ban thanh, van tuan
dang xay » dang van
hieu van » hieu va, thien van, lieu va
thuy vat » thuc vat, thuy van, thuat vat
vat hanh » vat thanh, van hanh, va hanh
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca 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: thuoc sach ky ((dang xay) OR (van xay)) hoi. hieu van thanh thuy vat hanh va cua viet~.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((dang xay) or (van xay)) hoi. hieu van thanh thuy vat hanh va cua viet*.