Perhaps you should try some spelling variations:
thien van » thi van
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan, thuc day
van hac » van hoc, van ha, van hai
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cuu tre » cua tre, cau tren, cau treo
v nang » va nang, vu nang, van nang
tuc va » truc va, tuc xa, duc va
di cuu » di cau, di cua, dinh cuu

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 sanh)) v nang xa hoi. thien van hac ((tuc va) OR (thuc va)) hanh di cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) v nang xa hoi. thien van hac ((tuc va) OR (thuc va)) hanh di cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) v nang xa hoi. thien van hac ((tuc va) OR (thuc va)) hanh di cuu tre*.