Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
dao vi » dao voi, dao ve, dao va
vi cua » vai cua, di cua

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 ((nang xa) or (dang xay)) hoi. ((hieu va) or (lieu va)) cam thuc va dao vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (dang xay)) hoi. ((hieu va) OR (lieu va)) cam thuc va dao vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (dang xay)) hoi. ((hieu va) or (lieu va)) cam thuc va dao vi cua tre*.