Perhaps you should try some spelling variations:
thien van » thi van
ly quang » vu quang
thanh vi » hanh vi, thanh va, thanh ve
le quang » vu quang
van cac » van hac, van cau, van bac
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
luc va » tuc va, loc va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ly quang) or (le quang)) x ho. thien van cac ((luc va) OR (duc va)) thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ly quang) OR (le quang)) x ho. thien van cac ((luc va) OR (duc va)) thanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ly quang) or (le quang)) x ho. thien van cac ((luc va) OR (duc va)) thanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((ly quang) or (le quang)) x ho. thien van cac ((luc va) OR (duc va)) thanh vi cuu tre*.