Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
danh dai » danh dau, danh di, danh sai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang xa » nang x, lang xa, nang ma
duoc va » nuoc va, duc va, duoc ma
sac ky » cac ky
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 ((sac ky) OR (sai ky)) nang xa hoi. hieu van chat ((soc va) or (duoc va)) danh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) nang xa hoi. hieu van chat ((soc va) OR (duoc va)) danh dai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (sai ky)) nang xa hoi. hieu van chat ((soc va) or (duoc va)) danh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) nang xa hoi. hieu van chat ((soc va) or (duoc va)) danh dai cua viet*.