Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
cam duc » cao duc, pham duc, nam duoc
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
bo sach » co sach, hoc sach
ca hoi » cau hoi, cua hoi, xa hoi
vi cua » vai cua, di 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) or (bo sach)) ty hang ca hoi. hieu qua ((cam duc) OR (cam xuc)) ban thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (bo sach)) ty hang ca hoi. hieu qua ((cam duc) OR (cam xuc)) ban thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (bo sach)) ty hang ca hoi. hieu qua ((cam duc) OR (cam xuc)) ban thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (bo sach)) ty hang ca hoi. hieu qua ((cam duc) OR (cam xuc)) ban thanh vi cua te*.