Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
danh dai » danh dau, danh di, vanh dai
danh sai » dung sai, danh bat, danh dau
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
duoc va » nuoc va, duc va, duoc ma
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang xa hoi. hieu van chat ((soc va) or (duoc va)) ((danh dai) OR (danh sai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang xa hoi. hieu van chat ((soc va) OR (duoc va)) ((danh dai) OR (danh sai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang xa hoi. hieu van chat ((soc va) or (duoc va)) ((danh dai) OR (danh sai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang xa hoi. hieu van chat ((soc va) or (duoc va)) ((danh dai) OR (danh sai)) cua viet*.