Perhaps you should try some spelling variations:
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
sach ky » sach y, sach ty, sach kem
hac tuc » thac toc, thai tuc
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
va hac » van hac, va khac, va cac
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky
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: thu ((sach ky) OR (sac ky)) nang x hoi. hieu va hac tuc va ((danh vi) or (danh di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang x hoi. hieu va hac tuc va ((danh vi) OR (danh di)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sac ky)) nang x hoi. hieu va hac tuc va ((danh vi) or (danh di)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sac ky)) nang x hoi. hieu va hac tuc va ((danh vi) or (danh di)) cuu tre*.