Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cau treo » cau theo, cau tren, cau triet
danh sai » dung sai, danh bat, danh dau
danh vai » danh va, doanh van, dang van
vien cac » vien bach, vien dai, vien da
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren
tu sach » thu sach, su sach, te sach
cac bo » bac bo, cac co
bo van » vo van, so van, do van

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 ly nang xa hoi. hieu vien cac bo van ((danh vai) OR (danh sai)) ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. hieu vien cac bo van ((danh vai) OR (danh sai)) ((cuu tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. hieu vien cac bo van ((danh vai) OR (danh sai)) ((cuu tre) or (cau treo))*".