Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sang tao » hang tai
sach ky » sac ky, sach y, sach ty
tao hai » tao dai, tao tai, tai hai
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cua » vai cua, di cua
cua te » cua tu

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 (cac ky)) sang tao hai. hieu ve tham thuc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (cac ky)) sang tao hai. hieu ve tham thuc va danh vi cua te.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (cac ky)) sang tao hai. hieu ve tham thuc va danh vi cua te*.