Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, 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 (sach y)) nang ((x hoi) OR (x ho)). hieu va cam xuc ban thanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang ((x hoi) OR (x ho)). hieu va cam xuc ban thanh va su tien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) nang ((x hoi) OR (x ho)). hieu va cam xuc ban thanh va su tien*".