Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
thuc xay » thuc day, tuc xay, thuat xay
sach ky » sac ky, sach y, sach ty
te sach » toc sach
qua nam » quan nam, cua nam, quang nam
nang ra » nang ma, lang ra, nang ro
nang co » nang cao, nang doc, nang noi
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang co) or (nang ra)) hoi. hieu qua nam thuc xay ((thanh vi) OR (thanh va)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang co) OR (nang ra)) hoi. hieu qua nam thuc xay ((thanh vi) OR (thanh va)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang co) or (nang ra)) hoi. hieu qua nam thuc xay ((thanh vi) OR (thanh va)) cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang co) or (nang ra)) hoi. hieu qua nam thuc xay ((thanh vi) OR (thanh va)) cua tu*.