Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai 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 sac ky nang cao hoi. hieu ve ((cam duc) or (pham duc)) ((ban thanh) OR (ban hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang cao hoi. hieu ve ((cam duc) OR (pham duc)) ((ban thanh) OR (ban hanh)) lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang cao hoi. hieu ve ((cam duc) or (pham duc)) ((ban thanh) OR (ban hanh)) lai cua tre*".