Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
ban hanh » ban hang
lang van » dang van, tang van, hoang van
sach thu » sach thue, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
lang xa » lang ha, dang xay
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 thu ((lang xa) OR (lang van)) hoi. hieu vien cac xuc ((va danh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((lang xa) OR (lang van)) hoi. hieu vien cac xuc ((va danh) OR (ban hanh)) vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((lang xa) OR (lang van)) hoi. hieu vien cac xuc ((va danh) or (ban hanh)) vai cua tre*".