Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
thuc dan » thuc hanh, hoc dan
dang xay » dang van, van xay
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
ve am » va am

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: vu sach ky ((lang xa) OR (dang xay)) hoi. hieu ve am ((thuc dan) OR (thuc vat)) hanh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((lang xa) OR (dang xay)) hoi. hieu ve am ((thuc dan) or (thuc vat)) hanh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((lang xa) OR (dang xay)) hoi. hieu ve am ((thuc dan) or (thuc vat)) hanh vai cua viet*.