Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dua ban » dia ban, cua ban, qua ban
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: su sach ky nang x hoi. hieu van tham ((dua ban) or (duc tan)) hanh vi ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu van tham ((dua ban) OR (duc tan)) hanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu van tham ((dua ban) or (duc tan)) hanh vi ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu van tham ((dua ban) or (duc tan)) hanh vi ((cua triet) OR (cua viet))*.