Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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) or (sac ky)) nang ((xa hoi) or (o hoi)). hieu ve cam thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang ((xa hoi) OR (o hoi)). hieu ve cam thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) nang ((xa hoi) or (o hoi)). hieu ve cam thuc va hanh vi cua tre*.