Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
dang xay » dang van, van xay
cuc tre » duc tre, cua tre, cuu tre
cac dac » cac dan, cac dai, cac bac
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
sai ky » sac ky
ve cac » va cac, vien cac
su sai » su tai, su hai, su dai

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

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