Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
tham luc » than luc, tham nuoc, tham thuc
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
tu cach » tu cac
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
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: ((tu cach) or (thuoc sach)) y nang x hoi. hieu van tham luc va hanh di ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuoc sach)) y nang x hoi. hieu van tham luc va hanh di ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuoc sach)) y nang x hoi. hieu van tham luc va hanh di ((cuu tre) or (cua triet))*.