Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang va
cua tre » cuu tre, cua triet, dua tren
dang ha » dong ha, dung ha, lang ha
dung co » dung cho, dung cong, dung cua
va dung » van dung, va duong, vat dung
dam tu » nam tu, cam tu, tam tu
so dac » so dan
ve dam » ven dam, ke dam, va dam
dac ky » cac ky, dan ky, sac ky
cua te » cua tu

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

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