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
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
thuc va » thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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: thu ((sach ty) or (sac ky)) nang ma hoi. hieu van chat ((thuc va) or (thuc vat)) danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sac ky)) nang ma hoi. hieu van chat ((thuc va) OR (thuc vat)) danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sac ky)) nang ma hoi. hieu van chat ((thuc va) or (thuc vat)) danh dai cua tre*.