Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh dinh » thanh dinh, hinh dinh, hanh tinh
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
sac ky » sai ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (cac ky)) nang x hoi. hieu vien cac xuc van hanh dinh ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang x hoi. hieu vien cac xuc van hanh dinh ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) nang x hoi. hieu vien cac xuc van hanh dinh ((cua tre) OR (cuu tre))*".