Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
cua viet » ca viet, hoa viet, cua vat
lang xa » lang ha, dang xay, lang van
qua cai » qua hai, qua cac, qua ca
cai duc » cao duc, mai duc, hoai duc
hanh di » hanh vi, hanh de, hang di
san ky » sang ky, ban ky, tan ky
di cua » dai cua, doi cua, de cua

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

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