Perhaps you should try some spelling variations:
thien van » thi van
su sach » vu sach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
xang xa » lang xa, mang xa, ang xa
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ty xang xa hoi. thien van cau ((xuc va) or (thuc va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty xang xa hoi. thien van cau ((xuc va) OR (thuc va)) hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty xang xa hoi. thien van cau ((xuc va) or (thuc va)) hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty xang xa hoi. thien van cau ((xuc va) or (thuc va)) hanh va cua tre*.