Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dai khoa » tai khoa, dac khoa, dai hoa
vien cac » vien bach, vien dai, vien da
hanh day » hanh may, han day, hanh dao
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
day cua » dai cua
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) OR (da khoa)). hieu vien cac luc va hanh day cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang ((dai khoa) OR (da khoa)). hieu vien cac luc va hanh day cua tre".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang ((dai khoa) OR (da khoa)). hieu vien cac luc va hanh day cua tre*.