Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, kho tang, ky trong
hai cua » thai cua, dai cua, hoi cua
ky dang » ky nang, ky danh
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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

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