Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua viet » hoa viet, cua vat, cua dieu
te sach » toc sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ca viet » va viet, co viet, hoa viet
sach v » sach va, sach y, sach 2

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: te sach v ((nang xa) OR (nang x)) hoi. hieu ve pham thuc va danh di ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v ((nang xa) OR (nang x)) hoi. hieu ve pham thuc va danh di ((cua viet) or (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: te sach v ((nang xa) OR (nang x)) hoi. hieu ve pham thuc va danh di ((cua viet) or (ca viet))*.