Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh lai » thanh hai, thanh lap, thanh loi
sach thi » sach tai, sach thieu, sach tham
dua tren » dung tren
sach thu » sach thue, sach thieu, sach tham
ve chao » ve chat, ve cham, ve cho
hieu ve » hieu va, hieu van
hang ca » hang va, nang cao, hang tai
cuu tre » cua tre, cau tren, cau treo
xu van » tu van, vu van, su van
ca hoi » cau hoi, cua hoi, xa hoi

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 thi) OR (sach thu)) hang ca hoi. hieu ve chao xu van thanh lai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thi) OR (sach thu)) hang ca hoi. hieu ve chao xu van thanh lai ((dua tren) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thi) OR (sach thu)) hang ca hoi. hieu ve chao xu van thanh lai ((dua tren) or (cuu tre))*".