Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
hanh nam » thanh nam, hanh lam, hanh ngay
va triet » va thiet, va trien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me 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 y nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc manh) or (duc tan)) hanh nam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc manh) OR (duc tan)) hanh nam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc manh) or (duc tan)) hanh nam va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc manh) or (duc tan)) hanh nam va triet*.