Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu viec » nhieu viec, hieu ve, sieu viet
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
su cac » tu cac, su cao, su can

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

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