Perhaps you should try some spelling variations:
thanh tri » thanh tra, thanh tai, chinh tri
hieu ve » hieu va, hieu van
cac ban » cac dan, cac van, can ban
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ve cam » ve cham, ve cac, va cam
x hoi » o hoi, x ho, 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: tu sai ky nang ((x hoi) OR (xa hoi)). hieu ve cam ((cac ban) or (cuu van)) thanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((x hoi) OR (xa hoi)). hieu ve cam ((cac ban) OR (cuu van)) thanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang ((x hoi) OR (xa hoi)). hieu ve cam ((cac ban) or (cuu van)) thanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((x hoi) OR (xa hoi)). hieu ve cam ((cac ban) or (cuu van)) thanh tri cua tre*.