Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
day nhanh » day thanh, duy nhanh, dac nhan
hieu van » thien van, lieu va, hieu ve
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
nhanh di » nhanh vi, nhanh li, nhanh dien
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang

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 y nang x ho. ((hieu van) or (hieu va)) cam thuc day nhanh di ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. ((hieu van) OR (hieu va)) cam thuc day nhanh di ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. ((hieu van) or (hieu va)) cam thuc day nhanh di ((cua triet) or (su triet))*.