Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hoa nang » hoa lang, ho nang, hoi nang
va triet » va thiet, va trien, cua triet
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
sach hoa » sach ha, sach hoi, bach hoa
hanh ve » hanh vi, hanh va, hanh kem
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
va nam » van nam, ha nam, va nay
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoa nang x hoi. lieu va nam thuc dan ((hanh di) or (hanh ve)) ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoa nang x hoi. lieu va nam thuc dan ((hanh di) OR (hanh ve)) ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoa nang x hoi. lieu va nam thuc dan ((hanh di) or (hanh ve)) ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach hoa nang x hoi. lieu va nam thuc dan ((hanh di) or (hanh ve)) ((va triet) OR (ve triet))*.