Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, nam duoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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