Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
phan cua » nhan cua, than cua, phat cua
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
cua tre » cua te, cuu tre, cua triet
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 dang ((xay hoi) or (xa hoi)). hieu ve chao xu ((van thanh) OR (ban thanh)) phan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky dang ((xay hoi) OR (xa hoi)). hieu ve chao xu ((van thanh) OR (ban thanh)) phan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky dang ((xay hoi) or (xa hoi)). hieu ve chao xu ((van thanh) OR (ban thanh)) phan cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ky dang ((xay hoi) or (xa hoi)). hieu ve chao xu ((van thanh) OR (ban thanh)) phan cua tre*.