Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

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