Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam thuc » nam thuoc, nam thu, nam tu
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc

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 xa hoi. hieu ve ((cam tuc) or (((nam thuc) OR (am thuc)))) ban thanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ve ((cam tuc) OR (((nam thuc) OR (am thuc)))) ban thanh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ve ((cam tuc) or (((nam thuc) OR (am thuc)))) ban thanh va su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ve ((cam tuc) or (((nam thuc) OR (am thuc)))) ban thanh va su triet*.