Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tham hoc » thai hoc, tham hoa, than hoc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su sach » so sach, vu sach
tang ma » tang van
va tham » van tham, va cham, va thanh
sach 7 » sach y, sach 2
ve su » va su

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 7 ((tang ma) or (mang may)) hoa. lieu va tham hoc ((va danh) OR (va hanh)) ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 ((tang ma) OR (mang may)) hoa. lieu va tham hoc ((va danh) OR (va hanh)) ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 7 ((tang ma) or (mang may)) hoa. lieu va tham hoc ((va danh) OR (va hanh)) ve su triet".
• Adding a wildcard symbol may retrieve word variants: su sach 7 ((tang ma) or (mang may)) hoa. lieu va tham hoc ((va danh) OR (va hanh)) ve su triet*.