Perhaps you should try some spelling variations:
thanh tra » thanh toan, thanh hoa
thanh tri » thanh tai, chinh tri, thanh hai
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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