Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
sach kem » hanh kem
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
cau tre » cau tren, cau treo, cau tra
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
di cau » da cau, diem cau

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 kem) or (sac ky)) nang x ho. hieu ve cam thuc ((va danh) or (van hanh)) di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sac ky)) nang x ho. hieu ve cam thuc ((va danh) OR (van hanh)) di cau tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sac ky)) nang x ho. hieu ve cam thuc ((va danh) or (van hanh)) di cau tre*.