Perhaps you should try some spelling variations:
nang viet » anh viet
phan thuc » nhan thuc, phap thuc, pham thuc
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
vat nang » van nang, va nang, vat mang
viet cua » viec cua, viet ca, viet qua
va phan » van phan, va phat, va phap
y nang » ky nang, ly nang, v nang
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: ((doc sach) or (toc sach)) y nang x hoi. lieu va phan thuc vat nang viet cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) y nang x hoi. lieu va phan thuc vat nang viet cua triet.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (toc sach)) y nang x hoi. lieu va phan thuc vat nang viet cua triet*.