Perhaps you should try some spelling variations:
thanh tra » thanh toan, thanh hoa
ban thanh » ban hanh, ban hang
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
tang ma » tang van
tra cua » trau cua, trua cua, tra cuu
hieu ve » hieu van
duc ban » duc tan, duc van, dua ban
hieu va » lieu va, hieu qua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

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