Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh giau » thanh gian, danh gia, anh giao
hieu van » hieu va, thien van, lieu va
giau cua » gian cua, gia cua, dieu cua
van hanh » van thanh, ban hanh, van anh
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
x hoi » o hoi, x ho, 5 hoi

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

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