Perhaps you should try some spelling variations:
manh anh » minh anh, anh anh, thanh anh
cua tre » cua te, cuu tre, cua triet
dao duc » giao duc, tao duoc
thi cua » thai cua, thi cuc, tri cua
anh thi » anh tho, dinh thi, dang thi
dang ha » dong ha, dung ha, lang ha
hieu ve » hieu va, hieu van
cao duc » cao suc, giao duc, tao duoc
sac ky » cac ky

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