Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach lo nang x hoi. ((hieu van) OR (hieu va)) nam thuc va hanh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach lo nang x hoi. ((hieu van) OR (hieu va)) nam thuc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach lo nang x hoi. ((hieu van) OR (hieu va)) nam thuc va hanh di cua viet*.