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