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
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc
so sac » so sach, so dac
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: so sac ky nang dai khoa. ((hieu ve) or (lieu va)) ((cam luc) OR (cau 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) OR (cau luc)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang dai khoa. ((hieu ve) or (lieu va)) ((cam luc) OR (cau 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) OR (cau luc)) va hanh dai cua tre*.