Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thu hang » thi hang, thuc hanh, thu huong
thanh do » thanh de, thanh pho, thanh loi
su sach » so sach, vu sach
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
cuu tre » cua tre, cau tren, cau treo
va dau » va dao

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 ((thu hang) or (ty xang)) xa hoi. lieu va dau tuc van ((thanh do) OR (thanh hoa)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thu hang) OR (ty xang)) xa hoi. lieu va dau tuc van ((thanh do) OR (thanh hoa)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thu hang) or (ty xang)) xa hoi. lieu va dau tuc van ((thanh do) OR (thanh hoa)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((thu hang) or (ty xang)) xa hoi. lieu va dau tuc van ((thanh do) OR (thanh hoa)) cuu tre*.