Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
dieu cua » dieu tra
va thanh » gia thanh, ban thanh, va tinh
cac truc » cau truc, cac tru, cac trung
truc va » thuc va, thuc vat, trung va
su sach » vu sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
de cua » le cua, te cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xa hoi. hieu vien cac truc va thanh ((de cua) OR (dieu cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky dang xa hoi. hieu vien cac truc va thanh ((de cua) OR (dieu cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. hieu vien cac truc va thanh ((de cua) OR (dieu cua)) tre*.