Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
dai khoa » da khoa, tai khoa, dac khoa
hanh dai » hanh tai, hanh dao, vanh dai
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang dai khoa. ((hieu ve) or (lieu va)) cam luc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang dai khoa. ((hieu ve) OR (lieu va)) cam luc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sac ky nang dai khoa. ((hieu ve) or (lieu va)) cam luc va hanh dai cua tre*.