Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
manh hanh » xanh hanh, danh thanh, minh thanh
thai cua » than cua, tai cuc, tri cua
duc manh » suc manh, duc anh, duc minh
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang va
dang ha » dong ha, dung ha, lang ha
sai ky » sac ky
ve cac » vien cac
su sai » su tai, su hai, su dai

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