Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
cham duc » cham soc, pham duy, phan duc
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
x hoi » xa hoi, o hoi, x ho
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang x hoi. hieu ve ((cham duc) or (pham duc)) va xanh di va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang x hoi. hieu ve ((cham duc) OR (pham duc)) va xanh di va trien.
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang x hoi. hieu ve ((cham duc) or (pham duc)) va xanh di va trien*.