Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thu hoach
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
cao duc » dao duc, cao suc, giao duc
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) OR (thuoc sach)) y nang x hoi. hieu va cao duc van hanh va ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang x hoi. hieu va cao duc van hanh va ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang x hoi. hieu va cao duc van hanh va ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang x hoi. hieu va cao duc van hanh va ((cua triet) or (su triet))*.