Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
vien cua » viec cua, dien cua, tien cua
hieu van » hieu va, thien van, lieu va
cac duc » cac du, cao duc, cac dac
dao duc » giao duc, tao duoc
sach ky » sac ky, sach y, sach kem
tang xa » trang xa, tang ma, lang xa
sach ty » sach y, sach tu, sach thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach ty)) tang xa hoi. hieu van ((cac duc) or (dao duc)) ban thanh vien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) tang xa hoi. hieu van ((cac duc) OR (dao duc)) ban thanh vien cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) tang xa hoi. hieu van ((cac duc) or (dao duc)) ban thanh vien cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) tang xa hoi. hieu van ((cac duc) or (dao duc)) ban thanh vien cua triet*.