Perhaps you should try some spelling variations:
thien van » thi van
thanh hai » thanh phan, thanh hoa, thanh san
so sach » so sanh, bo sach, co sach
hai chu » hai chau, hoi chu, hai chi
sach ly » sach y, sach lo, sach ty
van bac » van ban, van bao, van hac
doc hoi » duoc hoi, hoc hoi, doc hai
duc hai » cuc hai, duc dai, duc hau
ly nang » ky nang, ly hang, ly vang
chu tre » cho tre, chu tri, cuu tre
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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: so sach ly nang ((doc hoi) OR (duc hai)). thien van bac ((xuc va) OR (luc va)) thanh hai chu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang ((doc hoi) or (duc hai)). thien van bac ((xuc va) OR (luc va)) thanh hai chu tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ((doc hoi) or (duc hai)). thien van bac ((xuc va) OR (luc va)) thanh hai chu tre*.