Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
minh thanh » dinh thanh, tinh thanh, hinh thanh
thai cua » than cua, tai cuc, tri cua
duc minh » duc anh
sach ky » sac ky, sach ty, sach kem
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, so hai
ve cac » va cac, vien cac
o hai » so hai, o lai, _ hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang ((o hai) OR (co hai)). hieu ve cac duc minh thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ((o hai) OR (co hai)). hieu ve cac duc minh thanh thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ((o hai) OR (co hai)). hieu ve cac duc minh thanh thai cua tre*".