Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
vien cac » vien bach, vien dai, vien da
tai cua » thai cua, tai cuc, tri cua
cuu ban » cuu van, cua ban, cuu san
cac cuu » cap cuu, cac cau, cac chu
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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