Perhaps you should try some spelling variations:
chat soc » cham soc, chat hoc, chat doc
van chat » cao chat
danh dau » lanh dao, hang dau, danh tu
danh dai » danh di, danh sai, vanh dai
sach kem » hanh kem
hieu van » hieu va, thien van, lieu va
ca viet » va viet, co viet, hoa viet
nang xa » nang x, lang xa, nang ma
soc va » hoc va, loc va, doc va
sac ky » cac ky, sai ky

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

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