Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
cap nuoc » dat nuoc
ban hanh » ban hang
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu 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 y nang x hoi. hieu van ((cac nuoc) OR (cap nuoc)) ((va hanh) or (ban hanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu van ((cac nuoc) OR (cap nuoc)) ((va hanh) OR (ban hanh)) vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu van ((cac nuoc) OR (cap nuoc)) ((va hanh) or (ban hanh)) vi va triet*".