Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
trung ban » trong ban, trung van, trung can
ban hanh » ban hang
va triet » va thiet, va trien, ve triet
van nang » van quang, van ban, van dong
hanh te » hanh tu, hanh ve, hanh de
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, voi nang
x hoi » xa hoi, o hoi, x ho
te va » tu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: cuon sach ((v nang) or (van nang)) x hoi. hieu ((ve cam) or (va cam)) trung ban hanh te va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cuon sach ((v nang) OR (van nang)) x hoi. hieu ((ve cam) OR (va cam)) trung ban hanh te va triet.
• Adding a wildcard symbol may retrieve word variants: cuon sach ((v nang) or (van nang)) x hoi. hieu ((ve cam) or (va cam)) trung ban hanh te va triet*.