Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
bach tu » bach thu, cach tu, bac tu
sach ky » sac ky, sach y, sach ty
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
dan va » doan va, ban va, han va
x hoi » xa hoi, o hoi, x ho
tu ca » tu cac, tu cua, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x hoi. ((hieu vien) or (thieu nien)) bach tu ca ((dan va) OR (dan ca)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu vien) OR (thieu nien)) bach tu ca ((dan va) OR (dan ca)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu vien) or (thieu nien)) bach tu ca ((dan va) OR (dan ca)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu vien) or (thieu nien)) bach tu ca ((dan va) OR (dan ca)) cua tre*.