Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
anh thai » anh thi, anh tai, nhanh thai
manh anh » minh anh, anh anh, thanh anh
cua tre » cuu tre, cua triet, dua tren
dang ha » dong ha, dung ha, lang ha
hieu ve » hieu va, hieu van
dao duc » giao duc, tao duoc
ve dao » de dao, va dao, ve bao
sac ky » cac ky
cua te » cua tu

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