Perhaps you should try some spelling variations:
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cua triet, dua tren
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
va dan » ca dan, va dao, va dau
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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

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