Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
ve nam » he nam, va nam, le nam
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 ky) or (sai ky)) nang ma hoi. hieu ve nam thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sai ky)) nang ma hoi. hieu ve nam thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sai ky)) nang ma hoi. hieu ve nam thuc va hanh vi cua tre*.