Perhaps you should try some spelling variations:
dang xay » dang van, van xay
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
ve cac » va cac, vien cac

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 ((dang xay) OR (nang x)) hoi. hieu ve cac thuc day hanh ((di cua) OR (de cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((dang xay) or (nang x)) hoi. hieu ve cac thuc day hanh ((di cua) OR (de cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((dang xay) or (nang x)) hoi. hieu ve cac thuc day hanh ((di cua) OR (de cua)) triet*.