Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
va hanh » va thanh, va danh, ban hanh
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va cao suc ((va hanh) OR (van hanh)) va ((cua viet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu va cao suc ((va hanh) OR (van hanh)) va ((cua viet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu va cao suc ((va hanh) OR (van hanh)) va ((cua viet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu va cao suc ((va hanh) OR (van hanh)) va ((cua viet) or (va triet))*.