Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cao » vien cac, vien dai, vien da
cao thuc » cao thuoc, bao thuc, can thuc
thuc van » thuc vat, thuc dan, thuc va
su sach » vu sach
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ty nang xa hoi. hieu vien cao thuc van anh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang xa hoi. hieu vien cao thuc van anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang xa hoi. hieu vien cao thuc van anh vi cua tre*.