Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thai hoc » dai hoc, bai hoc, hoi hoc
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
su sach » so sach, vu sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
va thai » van thai, va tai, va tham

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 y ((nang ma) or (sang ma)) hoi. lieu va thai hoc va ((danh vi) OR (danh di)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang ma) OR (sang ma)) hoi. lieu va thai hoc va ((danh vi) OR (danh di)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang ma) or (sang ma)) hoi. lieu va thai hoc va ((danh vi) OR (danh di)) su triet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) or (sang ma)) hoi. lieu va thai hoc va ((danh vi) OR (danh di)) su triet*.