Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
cua tre » cua te, cuu tre, cua triet
cuc ban » cua ban, cac ban, cuu ban
cac cuc » cac cuoc, cac cua, cac nuoc
ky lang » ky nang, ky tang, tay lang
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ve cac » va cac, vien cac
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 ve cac cuc ban ((thanh vai) or (thanh van)) 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 ve cac cuc ban ((thanh vai) OR (thanh van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su cac ((ky lang) or (ky dang)) xa hoi. hieu ve cac cuc ban ((thanh vai) or (thanh van)) cua tre*.