Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cam duc » cam xuc, cao duc, pham duc
va phan » van phan, va phat, va phap
va cam » va cham, va cac, va cao
va han » van han, va hanh, va hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky nang xa hoi. lieu va cam duc ((va han) OR (va phan)) tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang xa hoi. lieu va cam duc ((va han) OR (va phan)) tri cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang xa hoi. lieu va cam duc ((va han) OR (va phan)) tri cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang xa hoi. lieu va cam duc ((va han) OR (va phan)) tri cua triet*.