Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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: tu ((sach ky) OR (sach y)) nang x hoi. hieu ve cac duc va ((danh vi) OR (danh di)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va ((danh vi) OR (danh di)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va ((danh vi) OR (danh di)) cuu tre*.