Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
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: thu sach ky nang ((x hoi) OR (xa hoi)). lieu va tham ((duc manh) or (duc tan)) hanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (xa hoi)). lieu va tham ((duc manh) OR (duc tan)) hanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (xa hoi)). lieu va tham ((duc manh) or (duc tan)) hanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (xa hoi)). lieu va tham ((duc manh) or (duc tan)) hanh de cua triet*.