Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
duc van » duc va, duc phan, duc hanh
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
va va » va van, va vua, va vai

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. hieu va cam ((((duc van) or (duc manh))) or (duc tan)) hanh va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ma hoi. hieu va cam ((((duc van) OR (duc manh))) OR (duc tan)) hanh va va triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ma hoi. hieu va cam ((((duc van) or (duc manh))) or (duc tan)) hanh va va triet*.