Perhaps you should try some spelling variations:
ban chinh » lan chinh, van chinh, hanh chinh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
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: tu sac ky nang ma hoi. ((hieu ve) OR (hieu va)) cam cuc ban chinh tri cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. ((hieu ve) OR (hieu va)) cam cuc ban chinh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. ((hieu ve) OR (hieu va)) cam cuc ban chinh tri cua tre*.