Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh van » thanh san, thanh toan, thanh phan
vien cap » vien cac, vien cao, vien can
va thanh » gia thanh, ban thanh, va tinh
cap nuoc » dat nuoc
cuu tre » cau tren, cau treo
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cua triet, dua tren
sac ky » cac ky, sai ky

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 ty) or (sac ky)) lang xa hoi. hieu vien cap nuoc va thanh van ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sac ky)) lang xa hoi. hieu vien cap nuoc va thanh van ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) or (sac ky)) lang xa hoi. hieu vien cap nuoc va thanh van ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sac ky)) lang xa hoi. hieu vien cap nuoc va thanh van ((cuu tre) OR (cua tre))*.