Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua triet » cua viet, su triet, va triet
nien cac » vien cac, dien cac, bien cac
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
duc van » duc va, duc tan, duc manh
hoc can » hoc dan, hoc cao, hoc cac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang xa) or (nang ma)) hoi. thieu nien cac ((duc van) or (hoc can)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (nang ma)) hoi. thieu nien cac ((duc van) OR (hoc can)) hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (nang ma)) hoi. thieu nien cac ((duc van) or (hoc can)) hanh vi cua triet*.