Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
ve cac » va cac, vien cac
du van » duy van, duc van, tu van
su dai » sau dai, si dai, su tai
su sai » su tai, su hai, su mai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) or (su dai)) ky ((dang xa) or (dang ha)) hoi. hieu ve cac du van thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky ((dang xa) OR (dang ha)) hoi. hieu ve cac du van thanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su dai)) ky ((dang xa) or (dang ha)) hoi. hieu ve cac du van thanh thai cua tre*.