Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
anh giao » nang giao, minh giao, danh gia
anh giau » canh giac, anh giang, danh giao
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cac co » cac cong
cac lo » cac lop, cac bo, cac 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 sach ky nang xa hoi. hieu vien ((cac lo) OR (cac co)) van ((anh giau) or (anh giao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu vien ((cac lo) OR (cac co)) van ((anh giau) OR (anh giao)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu vien ((cac lo) OR (cac co)) van ((anh giau) or (anh giao)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu vien ((cac lo) OR (cac co)) van ((anh giau) or (anh giao)) cua tre*.