Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
nam xuc » cam xuc, nam xua, nam thuc
y nang » ly nang, v nang, may nang
vi cua » vai cua, di cua

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 ((y nang) OR (ky nang)) mai hoi. hieu van nam xuc ((ban hanh) OR (va thanh)) vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) mai hoi. hieu van nam xuc ((ban hanh) or (va thanh)) vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) mai hoi. hieu van nam xuc ((ban hanh) or (va thanh)) vi cua triet*.