Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
ly quang » le quang, vu quang
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao
xuc va » duc va, tuc va, luc va
va cai » va cac, va bai, va dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ly hang) OR (ly quang)) xa hoi. hieu ((va cai) or (va cao)) xuc va thanh van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly hang) OR (ly quang)) xa hoi. hieu ((va cai) OR (va cao)) xuc va thanh van cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ly hang) OR (ly quang)) xa hoi. hieu ((va cai) or (va cao)) xuc va thanh van cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly hang) OR (ly quang)) xa hoi. hieu ((va cai) or (va cao)) xuc va thanh van cuu tre*.