Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh tai » thanh hai, thanh toan, doanh tai
vien cac » vien bach, vien dai, vien da
dang nam » dong nam, dan nam, dung nam
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dang ma » dang mau, dang mam, dang mat
cuc tre » duc tre, cua tre, cuu tre
xuc va » tuc va, luc va, xac 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 cac ((xuc va) OR (duc va)) thanh tai cuc 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 cac ((xuc va) OR (duc va)) thanh tai cuc 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 cac ((xuc va) OR (duc va)) thanh tai cuc tre*".