Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
su triet » su tien, ve triet
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su viet » so viet
su sai » su tai, su dai, su mai
su hai » su tai
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su hai)) ky nang x ho. hieu ve cam thuc va danh vi ((su triet) OR (su viet))~.
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su hai)) ky nang x ho. hieu ve cam thuc va danh vi ((su triet) or (su viet))*.