Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoa » thanh pho
dau tren » dau tien, dat tren, dau tieng
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
cam duc » cam xuc, nam duoc, lam duoc
cao duc » dao duc, cao suc, giao duc
hoa dau » hoa dan, hoa dai, hoa dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky sang xa hoi. lieu va ((((cam duc) or (pham duc))) or (cao duc)) ban thanh hoa dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky sang xa hoi. lieu va ((((cam duc) OR (pham duc))) OR (cao duc)) ban thanh hoa dau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky sang xa hoi. lieu va ((((cam duc) or (pham duc))) or (cao duc)) ban thanh hoa dau tren*.