Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
van thanh » ban thanh, van tuan
phan cuc » phan duc, phan cac, pham cuc
dat duoc » dat nuoc, da duoc, luat duoc
dao duc » giao duc, tao duoc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ly vang » ly hang, ly quang
ly van » le van, ly va, ly von
thue » thu, thuc, thuy

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((dat duoc) or (dao duc)) van thanh phan cuc thue~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((dat duoc) OR (dao duc)) van thanh phan cuc thue.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((dat duoc) or (dao duc)) van thanh phan cuc thue".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((dat duoc) or (dao duc)) van thanh phan cuc thue*.