Perhaps you should try some spelling variations:
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
qua nam » quan nam, cua nam, quang nam
thuc va » thuc vat, thuc dan, thuc day
dao via » dao va, dao viet, dao giao
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((lang xa) or (dang xay)) hoi. hieu qua nam thuc va dao via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (dang xay)) hoi. hieu qua nam thuc va dao via cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (dang xay)) hoi. hieu qua nam thuc va dao via cua tre*.