Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thuoc va » thuc va, thuoc ma, thuong va
va thanh » gia thanh, ban thanh, va tinh
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ve nam » va nam, le nam, te nam
he nam » ha nam, nghe nam
x hoi » xa hoi, o hoi, x ho
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 ky nang x hoi. hieu ((ve nam) OR (he nam)) thuoc va thanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((ve nam) OR (he nam)) thuoc va thanh vai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((ve nam) OR (he nam)) thuoc va thanh vai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((ve nam) OR (he nam)) thuoc va thanh vai ((va triet) or (va thiet))*.