Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
cua viet » ca viet, cua vat, cua dieu
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hanh de » hanh ve, hanh kem
tu san » thu san, tu ban, tu can
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua

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 lang) or (ky dang)) xa hoi. hieu qua ca duc tan hanh de ((cua viet) OR (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky lang) OR (ky dang)) xa hoi. hieu qua ca duc tan hanh de ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky lang) or (ky dang)) xa hoi. hieu qua ca duc tan hanh de ((cua viet) OR (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky lang) or (ky dang)) xa hoi. hieu qua ca duc tan hanh de ((cua viet) OR (hoa viet))*.