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
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
duoc va » nuoc va, duc va, duoc ma
nang xa » nang x, nang ma, mang xa
tu sach » thu sach, su sach, te sach
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 sach ky ((nang xa) OR (lang 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 sach ky ((nang xa) OR (lang 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 sach ky ((nang xa) OR (lang xa)) hoi. hieu van chat ((soc va) or (duoc va)) danh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van chat ((soc va) or (duoc va)) danh dai cua viet*.