Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh lai » thanh hai, thanh lap, thanh loi
cau theo » cau thi, cau tao
va thanh » gia thanh, ban thanh, va tinh
vien cac » vien bach, vien dai, vien da
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa

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) or (ky nang)) xa hoi. hieu vien cac tuc va thanh lai ((cua tre) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) xa hoi. hieu vien cac tuc va thanh lai ((cua tre) OR (cau theo)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) xa hoi. hieu vien cac tuc va thanh lai ((cua tre) or (cau theo))*.