Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
va nang » van nang, da nang, cam nang
hanh ki » hanh vi, hanh kien, thanh kim
hanh ky » hanh kem
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 ((va nang) or (van ban)) x hoi. hieu ve cac duc ban ((hanh ki) OR (hanh ky)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((va nang) OR (van ban)) x hoi. hieu ve cac duc ban ((hanh ki) OR (hanh ky)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((va nang) or (van ban)) x hoi. hieu ve cac duc ban ((hanh ki) OR (hanh ky)) su triet*".