Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
hanh ve » hanh vi, hanh va, hanh kem
hanh de » hanh kem
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
cau luc » cau truc, cau phuc
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu van ((cam xuc) OR (cau luc)) van ((hanh de) OR (hanh ve)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu van ((cam xuc) or (cau luc)) van ((hanh de) OR (hanh ve)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu van ((cam xuc) or (cau luc)) van ((hanh de) OR (hanh ve)) cua triet*.