Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, nam thu, nam tu
vat hanh » vat thanh, van hanh, va hanh
hanh via » hanh vi, hanh va, anh va
tu cach » tu cac
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
via cua » gia cua, gian cua, giau cua
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 cach) OR (su sach)) ky nang ma hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh via cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang ma hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh via cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang ma hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh via cua triet*.