Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
danh gia » dan gian
anh giau » anh giao, canh giac, anh giang
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
lo van » le van, vo van, so van
sac ky » cac ky, sai ky
dai lo » dai so, dai ly, dai o

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) OR (sac ky)) nang xa hoi. hieu vien dai lo van ((anh giau) or (danh gia)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu vien dai lo van ((anh giau) OR (danh gia)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang xa hoi. hieu vien dai lo van ((anh giau) or (danh gia)) cua tre*".