Perhaps you should try some spelling variations:
dang cay » dang xay, dang ca, dang cac
nam thuc » nam thuoc, am thuc, nam thu
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
dan vat » dang vat, dan va, dan dat
van vat » van chat, nhan vat
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sac ky)) dang cay phoi. hieu van nam thuc va ((dan vat) OR (van vat)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sac ky)) dang cay phoi. hieu van nam thuc va ((dan vat) OR (van vat)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sac ky)) dang cay phoi. hieu van nam thuc va ((dan vat) OR (van vat)) cuu tre*.