Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
tang hanh » tang thanh, dang hanh, nang hanh
vien cac » vien bach, vien dai, vien da
tac tang » tac vang, tuc tang, tay tang
toc cac » hoc cac, tuc cac, ton cac
ky lang » ky dang, ky tang, tay lang
cac tac » cac toc, cac bac, cac dac
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cac ((ky lang) or (ky nang)) xa hoi. hieu vien cac tac tang hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cac ((ky lang) OR (ky nang)) xa hoi. hieu vien cac tac tang hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc cac ((ky lang) or (ky nang)) xa hoi. hieu vien cac tac tang hanh di cua tre*.