Perhaps you should try some spelling variations:
thai thuc » thai thuy, thai tuc, tham thuc
thu sach » tu sach, thuat sach, thuoc sach
va triet » va trien, ve triet, cua triet
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
thuc va » thuc vat, thuc dan, thuc day
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

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