Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
so viet » hoc viet
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
co viet » o viet, hoc viet, hoa viet
xuc van » duc van, luc van, vuc van
tu san » thu san, tu ban, tu can
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: tu san ((ky lang) or (ky dang)) xa hoi. hieu va cam xuc van thanh di ((co viet) OR (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky lang) OR (ky dang)) xa hoi. hieu va cam xuc van thanh di ((co viet) OR (so viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky lang) or (ky dang)) xa hoi. hieu va cam xuc van thanh di ((co viet) OR (so viet))".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky lang) or (ky dang)) xa hoi. hieu va cam xuc van thanh di ((co viet) OR (so viet))*.