Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
ban bo » can bo, ban do, ban co
bo van » vo van, so van, do van
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. ((hieu ve) OR (hieu van)) ban bo van hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. ((hieu ve) OR (hieu van)) ban bo van hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. ((hieu ve) OR (hieu van)) ban bo van hanh vi su triet*.