Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
di va » dai va, di vao, doi va
thuc » thu

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