Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
nang mai » nang ma, nang tai, lang mai
danh doi » danh di, thanh doi, dung doi
sach ky » sac ky, sach ty, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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) or (sach y)) nang mai hoi. hieu va nham thuc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) nang mai hoi. hieu va nham thuc va danh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) nang mai hoi. hieu va nham thuc va danh doi cua tre*.