Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
thuc manh » thuc hanh, thuc thanh, thuc dan
thanh lai » thanh hai, thanh lap, thanh loi
va tuyen » va truyen, tac tuyen, ke tuyen
va trien » va truyen, va thiet, va tieng
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ty hang » ly hang, thi hang, thu hang
va am » va lam, va cam

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 ((ty hang) OR (ty xang)) xa hoi. hieu va am thuc manh thanh lai ((va trien) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va am thuc manh thanh lai ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va am thuc manh thanh lai ((va trien) or (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va am thuc manh thanh lai ((va trien) or (va tuyen))*.