Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ve » hanh ve, thanh va, thanh vien
hieu van » hieu va, thien van, lieu va
bach ty » sach ty, xach tay, bach thu
cam duc » cam xuc, cao duc, pham duc
cua tuc » cua tu, cua thuoc, luat tuc
duc ban » duc tan, duc van, dua ban
van cam » van nam, van lam, van cau
ty hang » ly hang, ty xang, thi hang
cua duc » cua nuoc, cua quoc
ca hoi » cau hoi, cua hoi, co hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ty hang ((ca hoi) OR (xa hoi)). hieu van cam duc ban thanh ve ((cua tuc) or (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ty hang ((ca hoi) OR (xa hoi)). hieu van cam duc ban thanh ve ((cua tuc) OR (cua duc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ty hang ((ca hoi) OR (xa hoi)). hieu van cam duc ban thanh ve ((cua tuc) or (cua duc))".
• Adding a wildcard symbol may retrieve word variants: vu bach ty hang ((ca hoi) OR (xa hoi)). hieu van cam duc ban thanh ve ((cua tuc) or (cua duc))*.