Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
va dinh » van dinh, va kinh, va tinh
dinh su » dinh so, hinh su, dinh cu
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
su va » su van, 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: thuoc sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cam) or (va cam)) duc va dinh su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cam) OR (va cam)) duc va dinh su va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cam) or (va cam)) duc va dinh su va triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cam) or (va cam)) duc va dinh su va triet*.