Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
nien cac » vien cac, dien cac, bien cac
nang xa » nang x, lang xa, nang ma
cac tao » cau tao, cac tro, cac tac
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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) or (vu bach)) ky nang xa hoi. thieu nien cac tao va dan va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (vu bach)) ky nang xa hoi. thieu nien cac tao va dan va cua triet.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (vu bach)) ky nang xa hoi. thieu nien cac tao va dan va cua triet*.