Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu vien » hieu hien, hieu viec, thieu nien
hanh hai » nhanh hai, hang hai, hanh tai
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
sanh ky » hanh ky, sang ky, nganh ky
cac duc » cac du, cac dac, cac nuoc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky lang xa hoi. hieu vien ((cac duc) OR (cao duc)) va ((hanh hai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky lang xa hoi. hieu vien ((cac duc) OR (cao duc)) va ((hanh hai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky lang xa hoi. hieu vien ((cac duc) OR (cao duc)) va ((hanh hai) or (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky lang xa hoi. hieu vien ((cac duc) OR (cao duc)) va ((hanh hai) or (thanh hai)) cua tre*.