Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh ve » hanh vi, hanh va, hanh kem
sang ky » sang kyo, dang ky, tang ky
lang ha » long ha
hanh de » hanh kem
ca duc » cao duc, cua duc, ca dua
san ky » van ky, dan ky, ban ky
ha hoi » hoa hoi, ha noi, xa hoi
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 ha hoi. hieu qua ca duc tan ((hanh de) or (hanh ve)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) lang ha hoi. hieu qua ca duc tan ((hanh de) OR (hanh ve)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) lang ha hoi. hieu qua ca duc tan ((hanh de) or (hanh ve)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) lang ha hoi. hieu qua ca duc tan ((hanh de) or (hanh ve)) cua viet*.