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, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang

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 xa hoi. hieu va cac ((duc manh) or (duc tan)) hanh nam ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu va cac ((duc manh) OR (duc tan)) hanh nam ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu va cac ((duc manh) or (duc tan)) hanh nam ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu va cac ((duc manh) or (duc tan)) hanh nam ((va triet) OR (va trien))*.