Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ve triet » va trien, su triet
van dinh » van minh, van dich, va dinh
cam duc » cam xuc, cao duc, nam duoc
dinh cu » dinh cuu, dinh chuc, dinh chau
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
cu ve » cuu ve, cua ve, cu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuat sach)) y nang x hoi. hieu ve ((cam duc) OR (pham duc)) van dinh cu ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat sach)) y nang x hoi. hieu ve ((cam duc) OR (pham duc)) van dinh cu ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuat sach)) y nang x hoi. hieu ve ((cam duc) OR (pham duc)) van dinh cu ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat sach)) y nang x hoi. hieu ve ((cam duc) OR (pham duc)) van dinh cu ve triet*.