Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
vu khach » vu khanh, vu khac, vay khach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
cam oc » cao oc
cua te » cua tu
cam o » cham o, cam lo, ca o

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (thuoc sach)) ky tang xa hoi. hieu ve ((cam oc) or (cam o)) ban thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thuoc sach)) ky tang xa hoi. hieu ve ((cam oc) OR (cam o)) ban thanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thuoc sach)) ky tang xa hoi. hieu ve ((cam oc) or (cam o)) ban thanh tai cua te*.