Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
dung tri » dung tai, dung tren, dung sai
sach ky » sac ky, sach y, sach ty
van bac » van bao, van hac, dan bac
va dung » van dung, va duong, vat dung
x hoi » xa hoi, o hoi, x ho
o hai » co hai, so hai, o lai

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 ky nang ((x hoi) or (o hai)). thien ((van bac) or (van ban)) nuoc va dung tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (o hai)). thien ((van bac) OR (van ban)) nuoc va dung tri cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) or (o hai)). thien ((van bac) or (van ban)) nuoc va dung tri cua triet*.