Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dinh vai » dinh van, dinh va, dinh tai
nang xa » nang x, lang xa, nang ma
cac lop » cac hop, cac loai
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
cac lo » cac co, cac bo, cac 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 cac ky nang xa hoi. hieu vien ((cac lo) or (cac lop)) va ((dinh vai) OR (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky nang xa hoi. hieu vien ((cac lo) OR (cac lop)) va ((dinh vai) OR (dinh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky nang xa hoi. hieu vien ((cac lo) or (cac lop)) va ((dinh vai) OR (dinh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky nang xa hoi. hieu vien ((cac lo) or (cac lop)) va ((dinh vai) OR (dinh vi)) cua tre*.