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