Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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 dang xay hoi. hieu va nam ((thuc va) or (thuc day)) dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. hieu va nam ((thuc va) OR (thuc day)) dan va cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. hieu va nam ((thuc va) or (thuc day)) dan va cuu tre*.