Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu hien » bieu hien, dieu hien, chieu chien
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
va cua » va chua, via cua, ca cua
cac tu » cac thu, cach tu, cac du
te sac » te cac, te san
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: ((te sac) OR (te sach)) ky nang x hoi. ((thieu nien) or (hieu hien)) cac tu va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky nang x hoi. ((thieu nien) OR (hieu hien)) cac tu va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te sach)) ky nang x hoi. ((thieu nien) or (hieu hien)) cac tu va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te sach)) ky nang x hoi. ((thieu nien) or (hieu hien)) cac tu va hanh va cua tre*.