Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
va thanh » gia thanh, ban thanh, va tinh
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu ke » hieu kem, chieu ke, hieu ky
ke phan » ve phan, kenh phan, ke thang
va hanh » van hanh, va danh, ban hanh
x hoi » xa hoi, o hoi, x ho
vi ve » va ve, gi ve, ve ve

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 ((ty nang) OR (ky nang)) x hoi. hieu ke phan duc ((va hanh) or (va thanh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) x hoi. hieu ke phan duc ((va hanh) OR (va thanh)) vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ky nang)) x hoi. hieu ke phan duc ((va hanh) or (va thanh)) vi ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ky nang)) x hoi. hieu ke phan duc ((va hanh) or (va thanh)) vi ve triet*.