Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu san » thuy san, thu ban, phu san
ca viet » co viet, hoa viet, san viet
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
va viet » hoa viet, san viet, mai viet
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
va cam » va cham, va cac, va cao

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