Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thanh van » thanh san, thanh toan, thanh phan
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
cac duc » cac du, cao duc, cac dac
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
ve cac » va cac, vien cac

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 ((nang ma) or (nang cao)) hoi. hieu ve cac duc va thanh van ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (nang cao)) hoi. hieu ve cac duc va thanh van ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) or (nang cao)) hoi. hieu ve cac duc va thanh van ((cua triet) OR (va triet))*".