Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
su triet » su viet, su tien, ve triet
co sach » bo sach, cuon sach
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
ve cac » va cac, vien cac
de su » den su, ve su, de tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (co sach)) ky nang x ho. hieu ve cac toc ((va danh) or (va hanh)) de su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (co sach)) ky nang x ho. hieu ve cac toc ((va danh) OR (va hanh)) de su triet.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (co sach)) ky nang x ho. hieu ve cac toc ((va danh) or (va hanh)) de su triet*.