Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
dan danh » van danh, han danh, ban danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
danh vi » hanh vi, dinh vi, danh di
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
cua te » cua tu
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 y nang x hoi. ((hieu ve) or (thien van)) nam thuc dan danh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. ((hieu ve) OR (thien van)) nam thuc dan danh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. ((hieu ve) or (thien van)) nam thuc dan danh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu ve) or (thien van)) nam thuc dan danh vi ((cua tre) OR (cua te))*.