Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
tan thanh » tran thanh, tang thanh, toan thanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang ma » tang van
cam duc » cam xuc, cao duc, pham duc
ve cam » ve cham, ve cac, va cam
su sac » su sach, su xac
su cac » tu cac, su cao, su can

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

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