Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
sach ky » sach y, sach ty, sach kem
cuc ban » cua ban, cac ban, cuu ban
cac cuc » cac cuoc, cac cua, cac nuoc
hieu va » lieu va, hieu qua
tang ma » tang van
sac ky » cac ky, sai ky
ve va » ve van, te va, ke va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sac ky)) ((tang ma) OR (mang may)) hoi. hieu va cac cuc ban thanh ve va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) ((tang ma) OR (mang may)) hoi. hieu va cac cuc ban thanh ve va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) ((tang ma) OR (mang may)) hoi. hieu va cac cuc ban thanh ve va triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) ((tang ma) OR (mang may)) hoi. hieu va cac cuc ban thanh ve va triet*.