Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu viec » nhieu viec, hieu ve, sieu viet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang xa » nang x, lang xa, nang ma
hanh de » hanh ve
cuu tre » cua tre, cau tren, cau treo
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang xa hoi. ((thieu nien) or (hieu viec)) cac nuoc va ((hanh de) OR (hanh kem)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((thieu nien) OR (hieu viec)) cac nuoc va ((hanh de) OR (hanh kem)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((thieu nien) or (hieu viec)) cac nuoc va ((hanh de) OR (hanh kem)) cuu tre*".