Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
cua viet » ca viet, hoa viet, cua dieu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, 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 hoi. hieu ve am ((thuc dan) OR (thuc vat)) hanh vi ((cua viet) OR (cua vat))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang xa hoi. hieu ve am ((thuc dan) or (thuc vat)) hanh vi ((cua viet) OR (cua vat))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. hieu ve am ((thuc dan) or (thuc vat)) hanh vi ((cua viet) OR (cua vat))*.