Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
xuc ban » duc ban, cuc ban, quoc ban
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
dan ky » van ky

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

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