Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
thuc hang » thuc hanh, thu hang, phuc hang
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, su tien, ve triet
va trien » va truyen, va thiet, va tuyen
so sach » so sanh, bo sach, co sach
qua hai » qua hoat
luc gia » luoc gia, quoc gia, duc giao
duc gia » quoc gia
va hoi » xa hoi, va hoc, va hoa

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 thuc hang va hoi. hieu qua hai ((luc gia) or (duc gia)) thanh vi ((su triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thuc hang va hoi. hieu qua hai ((luc gia) OR (duc gia)) thanh vi ((su triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: so sach thuc hang va hoi. hieu qua hai ((luc gia) or (duc gia)) thanh vi ((su triet) or (va trien))*.