Perhaps you should try some spelling variations:
nang doc » nang luc
tu sach » thu sach, su sach, te sach
doc hoi » duoc hoi, hoc hoi, doc hai
hieu vi » hieu voi, hieu va, hieu ve
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
hoi cua » hoi chuc
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
pham » phan

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 y nang doc hoi. hieu vi pham duc ((va hanh) OR (va danh)) ((di cua) OR (hoi cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang doc hoi. hieu vi pham duc ((va hanh) OR (va danh)) ((di cua) OR (hoi cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang doc hoi. hieu vi pham duc ((va hanh) OR (va danh)) ((di cua) OR (hoi cua)) triet*.