Perhaps you should try some spelling variations:
nhanh thai » nhanh thanh, nhanh thang, nhan tai
nhanh thi » nhanh thuc, nhan tai, nhanh ha
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
bao duc » dao duc, bao luc, cao duc
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sai ky » sac ky
su sai » su tai, su hai, su dai

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 ky dang xa hoi. ((hieu ve) OR (hieu van)) bao duc van ((nhanh thai) or (nhanh thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) bao duc van ((nhanh thai) OR (nhanh thi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) bao duc van ((nhanh thai) or (nhanh thi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang xa hoi. ((hieu ve) OR (hieu van)) bao duc van ((nhanh thai) or (nhanh thi)) cua tre*.