Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
van thanh » ban thanh, van tuan
nam duoc » nam thuoc, da duoc, dat duoc
su sach » so sach, vu sach
cao duc » dao duc, cao suc, giao duc
ly mang » ly hang, ly nang, ly quang
hai cua » thai cua, dai cua, hoi cua
ly vang » ly hang, ly van, ly quang
hieu ve » hieu va, hieu van
cua tu » cua tuc, cua su, cua cu

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

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