Perhaps you should try some spelling variations:
thien van » thi van
ban thua » bac thua, ban thuoc, gian thua
cau tren » cu tren, dau tren, ca tren
vu sach » vu bach, su sach, vu khach
vang xa » lang xa, mang xa, ang xa
ban thu » van thu, ban thi, ban tu
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y vang » ly vang

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: vu sach y vang xa hoi. thien van ((ban thua) OR (ban thu)) va hanh vi ((cua tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y vang xa hoi. thien van ((ban thua) OR (ban thu)) va hanh vi ((cua tre) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: vu sach y vang xa hoi. thien van ((ban thua) OR (ban thu)) va hanh vi ((cua tre) or (cau tren))*.