Perhaps you should try some spelling variations:
duoc manh » duc manh, duoc anh, duong manh
thai cua » than cua, tai cuc, tri cua
anh thai » anh thi, anh tai, nhanh thai
manh anh » minh anh, anh anh, thanh anh
cua tre » cua te, cuu tre, cua triet
dang ha » dong ha, dung ha, lang ha
ve tac » va tac, ve cac, ve tai
sac ky » cac ky
ve tao » ve bao, de tao, ve tai

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 tao) OR (ve tac)) duoc manh anh thai 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 tao) OR (ve tac)) duoc manh anh thai 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 tao) OR (ve tac)) duoc manh anh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sai ky) or (sac ky)) dang ha noi. hieu ((ve tao) OR (ve tac)) duoc manh anh thai cua tre*.