Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nang mai » nang ma, nang tai, lang mai
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac bac » cac bai, cac ban, cac cach
cac tac » cac toc, cac dac, cac tai
su sach » vu sach
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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) or (so sach)) y nang mai hoi. hieu van ((cac tac) or (cac bac)) va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang mai hoi. hieu van ((cac tac) OR (cac bac)) va hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang mai hoi. hieu van ((cac tac) or (cac bac)) va hanh di cua triet*.