Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
su sach » so sach, vu sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 nang xa hoi. ((hieu ve) OR (hieu van)) cam thuc dan ((hang di) OR (hang vi)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. ((hieu ve) OR (hieu van)) cam thuc dan ((hang di) or (hang vi)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. ((hieu ve) OR (hieu van)) cam thuc dan ((hang di) or (hang vi)) cua viet*.