Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, gian cac
dinh vai » dinh vi, dinh va, dinh tai
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
lo va » lo van, lao va, ly va

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) OR (vien da)) lo va ((dinh vai) or (dinh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky nang xa hoi. hieu ((vien cac) OR (vien da)) lo va ((dinh vai) OR (dinh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky nang xa hoi. hieu ((vien cac) OR (vien da)) lo va ((dinh vai) or (dinh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky nang xa hoi. hieu ((vien cac) OR (vien da)) lo va ((dinh vai) or (dinh van)) cua tre*.