Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh hai » thanh phan, thanh hoa, thanh san
vien dai » hien dai
va thanh » gia thanh, ban thanh, va tinh
dang nam » dong nam, dan nam, dung nam
cuc tre » cua tre, cuu tre, cuc thue
dai xuc » dai xu, dai luoc, dai thuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dang ma » dang mau, dang mam, dang mat
duc tre » duoc tren, duc tien
xuc va » duc va, tuc va, luc va

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 ((dang ma) or (dang nam)) hoi. hieu vien dai xuc va thanh hai ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang ma) OR (dang nam)) hoi. hieu vien dai xuc va thanh hai ((cuc tre) OR (duc tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang ma) or (dang nam)) hoi. hieu vien dai xuc va thanh hai ((cuc tre) OR (duc tre))*".