Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
danh dai » danh dau, danh di, danh sai
day danh » day manh, dai danh, dao danh
thuc day » thuc dan, thuc vat
hieu van » thien van, lieu va, hieu ve
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach y)) nang xa hoi. ((hieu van) or (hieu va)) nhan thuc day danh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang xa hoi. ((hieu van) OR (hieu va)) nhan thuc day danh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach y)) nang xa hoi. ((hieu van) or (hieu va)) nhan thuc day danh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach y)) nang xa hoi. ((hieu van) or (hieu va)) nhan thuc day danh dai cuu tre*.