Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky
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 (((sac ky) OR (sai ky)))) nang xa hoi. hieu qua cam thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (((sac ky) OR (sai ky)))) nang xa hoi. hieu qua cam thuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (((sac ky) OR (sai ky)))) nang xa hoi. hieu qua cam thuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (((sac ky) OR (sai ky)))) nang xa hoi. hieu qua cam thuc va hanh vi cua tre*.