Perhaps you should try some spelling variations:
ca viet » va viet, co viet, hoa viet
hang di » hang doi, hang vi, hang dien
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
hanh de » hanh ve, hanh kem
vuc van » duc van, luc van, thuc van
san ky » van ky, dan ky, ban ky
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) OR (sang ky)) lang xa hoi. hieu qua ca vuc van ((hanh de) or (hang di)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) lang xa hoi. hieu qua ca vuc van ((hanh de) OR (hang di)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) lang xa hoi. hieu qua ca vuc van ((hanh de) or (hang di)) ca viet".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) lang xa hoi. hieu qua ca vuc van ((hanh de) or (hang di)) ca viet*.