Perhaps you should try some spelling variations:
sach kem » hanh kem
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
van cau » van dau, van hau, van chat
nang xa » nang x, nang ma, mang xa
truc va » thuc va, thuc vat, trung va
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
lang xa » lang ha, dang xay, lang van
di cua » dai cua, doi cua, de 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: thu ((sach kem) OR (sach y)) ((nang xa) OR (lang xa)) hoi. hieu van cau truc va xanh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach kem) or (sach y)) ((nang xa) OR (lang xa)) hoi. hieu van cau truc va xanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: thu ((sach kem) or (sach y)) ((nang xa) OR (lang xa)) hoi. hieu van cau truc va xanh di cua viet*.