Perhaps you should try some spelling variations:
ban hanh » ban hang
so sang » so sanh, so dang, so lang
sang ky » sang kyo, dang ky, tang ky
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
ve cac » vien cac
vi cua » vai cua, di cua

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

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