Perhaps you should try some spelling variations:
ban banh » ban hanh, ban anh, ban danh
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
banh de » hanh de, banh keo, thanh de
cua tuc » cua duc, cua tu, cua thuoc
sac ky » cac ky, sai ky
de cua » le cua, te cua, dieu cua
x hoi » o hoi, x ho, 5 hoi

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 ky) OR (sac ky)) nang ((x hoi) or (xa hoi)). hieu va cac cuc ban banh de cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang ((x hoi) OR (xa hoi)). hieu va cac cuc ban banh de cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang ((x hoi) or (xa hoi)). hieu va cac cuc ban banh de cua tuc".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang ((x hoi) or (xa hoi)). hieu va cac cuc ban banh de cua tuc*.