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
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
di cua » dai cua, de cua, do 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 (doi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang doc hoi. hieu vi pham duc ((va hanh) OR (va danh)) ((di cua) OR (doi 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 (doi 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 (doi cua)) triet*.