Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
sang tay » sang tao, sang tai, sang tac
ve pham » vi pham, v pham, ve phat
ve phan » va phan, ke phan, ve phat
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
tay o » tay co

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach _ sang tay o. hieu ((ve pham) OR (ve phan)) duc van hanh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ sang tay o. hieu ((ve pham) OR (ve phan)) duc van hanh di ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ sang tay o. hieu ((ve pham) OR (ve phan)) duc van hanh di ((cua triet) or (va triet))*".