Perhaps you should try some spelling variations:
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
va nam » van nam, ha nam, va nay
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ly ((((nang x) or (dang xay))) or (nang ma)) hoi. hieu va nam thuc va hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly ((((nang x) OR (dang xay))) OR (nang ma)) hoi. hieu va nam thuc va hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ly ((((nang x) or (dang xay))) or (nang ma)) hoi. hieu va nam thuc va hang di cua tre*.