Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va triet » va trien, ve triet, cua triet
thuc gia » thuc giai, thue gia, thuc dia
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
le lang » le tang, le dang, le xang
lo lang » o lang, so lang, hoa lang
ve nam » he nam, va nam, le nam
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((lo lang) or (le lang)) xa hoi. hieu ve nam thuc gia thanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((lo lang) OR (le lang)) xa hoi. hieu ve nam thuc gia thanh vai ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((lo lang) or (le lang)) xa hoi. hieu ve nam thuc gia thanh vai ((va triet) or (va thiet))*.