Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
va thanh » gia thanh, ban thanh, va tinh
cap nuoc » dat nuoc
dang xay » dang van, van xay
vien cap » vien cac, vien cao, vien can
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((lang xa) or (dang xay)) hoi. hieu vien cap nuoc ((va thanh) or (may tinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((lang xa) OR (dang xay)) hoi. hieu vien cap nuoc ((va thanh) OR (may tinh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((lang xa) or (dang xay)) hoi. hieu vien cap nuoc ((va thanh) or (may tinh)) va cua tre*.