Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
sach kem » hanh kem
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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: su ((sach kem) OR (sach y)) lang xa hoi. thieu nien cac nuoc va ((danh di) OR (xanh di)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kem) or (sach y)) lang xa hoi. thieu nien cac nuoc va ((danh di) OR (xanh di)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach y)) lang xa hoi. thieu nien cac nuoc va ((danh di) OR (xanh di)) cua tre*.