Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh hoi » hanh thoi, hanh noi, hanh hoa
ban hanh » ban hang
tay hoi » tay ho, tao hoi, tay thai
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
xay hoi » cay phoi, gay thoi, may thoi
hoi cua » hoi chuc
su sach » so sach, vu sach

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 ky nang ((((xay hoi) OR (xa hoi))) or (tay hoi)). hieu van cac duc ban hanh hoi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((((xay hoi) OR (xa hoi))) OR (tay hoi)). hieu van cac duc ban hanh hoi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((((xay hoi) OR (xa hoi))) or (tay hoi)). hieu van cac duc ban hanh hoi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((((xay hoi) OR (xa hoi))) or (tay hoi)). hieu van cac duc ban hanh hoi cua triet*.