Perhaps you should try some spelling variations:
thanh tri » thanh tra, thanh tai, chinh tri
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
su tai » su thi, tu tai
su sai » su hai, su dai, su mai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) OR (su tai)) ky lang ha hoi. hieu van ((cam duc) or (giao duc)) van thanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su tai)) ky lang ha hoi. hieu van ((cam duc) OR (giao duc)) van thanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) OR (su tai)) ky lang ha hoi. hieu van ((cam duc) or (giao duc)) van thanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sai) OR (su tai)) ky lang ha hoi. hieu van ((cam duc) or (giao duc)) van thanh tri cua tre*.