Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh do » thanh de, thanh pho, thanh hoa
vu sach » vu bach, su sach, vu khach
cac bop » cac hop, cac lop
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
ty danh » ty doanh, ty anh, te danh
cac bo » bac bo, cac co
do cua » doi cua, co cua, de cua
cua te » cua tu

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 ((ty danh) or (ky danh)) xay hoi. hieu van ((cac bo) or (cac bop)) ban thanh do cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty danh) OR (ky danh)) xay hoi. hieu van ((cac bo) OR (cac bop)) ban thanh do cua te.
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty danh) or (ky danh)) xay hoi. hieu van ((cac bo) or (cac bop)) ban thanh do cua te*.