Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
ban hanh » ban hang
hien cac » thien cac, vien cac, hieu cac
cac tru » ca tru, cac tro, cac thu
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, mang may
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2

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 v ((nang ma) OR (nang cao)) hoi. hieu hien cac tru ((va hanh) or (ban hanh)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang ma) OR (nang cao)) hoi. hieu hien cac tru ((va hanh) OR (ban hanh)) vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang ma) OR (nang cao)) hoi. hieu hien cac tru ((va hanh) or (ban hanh)) vai cua triet*".