Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
so sach » so sanh, bo sach, co sach
van cua » vang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
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: so sach ((thu nang) OR (thu hang)) ma hoi. hieu va ((tao duoc) or (giao duc)) ban thanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) ma hoi. hieu va ((tao duoc) OR (giao duc)) ban thanh van cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) OR (thu hang)) ma hoi. hieu va ((tao duoc) or (giao duc)) ban thanh van cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) OR (thu hang)) ma hoi. hieu va ((tao duoc) or (giao duc)) ban thanh van cua te*.