Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, tai khoa, cac khoi
mai hoi » dai hoi, lai hoi, mai doi
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
ma hoi » xa hoi, ma hoa, me hoi
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang ((ma hoi) or (((mai hoi) or (mai khoi)))). hieu van cam luc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ((ma hoi) OR (((mai hoi) OR (mai khoi)))). hieu van cam luc va hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ((ma hoi) or (((mai hoi) or (mai khoi)))). hieu van cam luc va hanh vi cua triet*.