Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet
duc manh » suc manh, duc anh, duc minh
va triet » va thiet, va trien, ve triet
hieu vo » hieu voi, hieu va, hieu ve
xuc van » duc van, luc van, vuc van
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: thuoc sach y nang x hoi. hieu vo co ((xuc van) or (duc manh)) hanh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang x hoi. hieu vo co ((xuc van) OR (duc manh)) hanh vi ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang x hoi. hieu vo co ((xuc van) or (duc manh)) hanh vi ((cua triet) or (va triet))*.