Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dinh vai » dinh van, dinh vi, dinh va
van dinh » van minh, van dich, va dinh
thuc van » thuc vat, thuc dan, thuc va
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
ro hai » co hai, o hai, do hai
vai su » va su, van su, lai su
so hai » son hai, su hai, so ha
va am » va lam, 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: tu sach ((y nang) OR (ly nang)) ((ro hai) OR (so hai)). hieu va am thuc van dinh vai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) ((ro hai) or (so hai)). hieu va am thuc van dinh vai su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) ((ro hai) or (so hai)). hieu va am thuc van dinh vai su triet*.