Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
doc va » duoc va, hoc va, duc va
loc va » hoc va, luc va
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: tu sach y nang x hoi. lieu va cham ((doc va) or (loc va)) hanh di ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. lieu va cham ((doc va) OR (loc va)) hanh di ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. lieu va cham ((doc va) or (loc va)) hanh di ((su triet) or (cua viet))*.