Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
hanh vai » hanh vi, hanh va, hanh tai
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, lai cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x hoi. hieu van chat ((duc ban) or (duc van)) hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu van chat ((duc ban) OR (duc van)) hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu van chat ((duc ban) or (duc van)) hanh vai cua triet*.