Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh hai » thanh phan, thanh hoa, thanh san
sach dao » lanh dao
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
sac cao » bac cao, xac cao, sach cap
tang ma » tang van
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac cao) OR (sach dao)) ((tang ma) or (mang may)) hoi. hieu ve cam duc tan thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac cao) OR (sach dao)) ((tang ma) OR (mang may)) hoi. hieu ve cam duc tan thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac cao) OR (sach dao)) ((tang ma) or (mang may)) hoi. hieu ve cam duc tan thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sac cao) OR (sach dao)) ((tang ma) or (mang may)) hoi. hieu ve cam duc tan thanh hai cua tre*.