Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang va
dang ha » dong ha, lang ha, tang ha
duc van » duc va, duc tan, duc manh
dung ha » dung va, dung he, dung khoa
cac duc » cac du, cao duc, cac dac
su tai » su thi, tu tai
ve cac » va cac, vien cac
tai ky » thai ky, trai ky, sai ky

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

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