Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
tai cua » thai cua, tai cuc, tri cua
ve chat » va chat, van chat
tuu va » cuu va, tru va, thu va

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 thu) or (sach tham)) hang xa hoi. hieu ve chat ((tuu va) OR (tu va)) thanh tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach thu) OR (sach tham)) hang xa hoi. hieu ve chat ((tuu va) OR (tu va)) thanh tai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach thu) or (sach tham)) hang xa hoi. hieu ve chat ((tuu va) OR (tu va)) thanh tai cua viet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach thu) or (sach tham)) hang xa hoi. hieu ve chat ((tuu va) OR (tu va)) thanh tai cua viet*.