Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac thuc » cach thuc, cac thu, can thuc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
mang xa » lang xa, mang may, dang xay
van cac » van hac, van cau, van bac
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sach v » sach va, sach y, sach 2
di su » doi su, ki su, da su

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: su sach v ((mang xa) OR (nang x)) hoi. hieu van cac thuc va hanh di su triet~.
• Adding a wildcard symbol may retrieve word variants: su sach v ((mang xa) or (nang x)) hoi. hieu van cac thuc va hanh di su triet*.