Perhaps you should try some spelling variations:
dang mam » dang nam, dang mau, dang mat
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
dang ma » dang mau, dang mat, tang ma
ban ky » van ky, dan ky
tuc va » thuc va, truc va, duc va
tu ban » thu ban, te ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky ((dang ma) OR (dang mam)) hoi. hieu ve cham ((tuc va) or (tuc xa)) dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky ((dang ma) OR (dang mam)) hoi. hieu ve cham ((tuc va) OR (tuc xa)) dan vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky ((dang ma) OR (dang mam)) hoi. hieu ve cham ((tuc va) or (tuc xa)) dan vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ban ky ((dang ma) OR (dang mam)) hoi. hieu ve cham ((tuc va) or (tuc xa)) dan vai cua tre*.