Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
van thanh » ban thanh, van tuan
than cua » nhan cua, thai cua, ban cua
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cao duc » cao suc, giao duc, tao duoc
dao duc » giao duc, tao duoc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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 xa hoi. hieu van ((cao duc) OR (dao duc)) van thanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su tai)) ky lang xa hoi. hieu van ((cao duc) OR (dao duc)) van thanh than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) or (su tai)) ky lang xa hoi. hieu van ((cao duc) OR (dao duc)) van thanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su tai)) ky lang xa hoi. hieu van ((cao duc) OR (dao duc)) van thanh than cua tre*.