Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tuc ban » thuc ban, truc ban, tu ban
ve cac » va cac, vien cac
di cua » doi cua, de cua, do cua

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) or (co sach)) ky nang x ho. hieu ve cac tuc ban thanh ((di cua) OR (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang x ho. hieu ve cac tuc ban thanh ((di cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky nang x ho. hieu ve cac tuc ban thanh ((di cua) OR (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang x ho. hieu ve cac tuc ban thanh ((di cua) OR (dai cua)) triet*.