Perhaps you should try some spelling variations:
dang mam » dang nam, dang mau, dang mat
cac thoi » cac toi, cac hop, cac tro
cua tre » cua te, cuu tre, cua triet
dang ma » dang mau, dang mat, tang ma
hanh ca » hanh cac, hanh cat, hanh cua
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cac thu » cach thuc
ca cua » co cua
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky

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

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