Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
anh giau » anh giao, canh giac, anh giang
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
lo van » le van, vo van, so van
dai lo » dai so, dai ly, dai o
cua te » cua tu

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 ty nang xa hoi. hieu vien dai lo van ((anh giau) or (nang cao)) ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu vien dai lo van ((anh giau) OR (nang cao)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu vien dai lo van ((anh giau) or (nang cao)) ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu vien dai lo van ((anh giau) or (nang cao)) ((cua tre) OR (cua te))*.