Perhaps you should try some spelling variations:
ca viet » va viet, co viet, hoa viet
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
xuc van » duc van, luc van, vuc van
qua cua » quan cua, quang cua, qua quan
cua xuc » cua duc, cua tuc, cua cuc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
thu san » thuy san, thu ban, phu san
tu san » tu ban, tu can, vu san

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