Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu san » hieu van, hieu sau, chieu sang
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
dan su » dang su
pham » phan

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 ky nang xa hoi. hieu san pham duc ((ban thanh) or (van anh)) dan su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu san pham duc ((ban thanh) OR (van anh)) dan su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu san pham duc ((ban thanh) or (van anh)) dan su triet*.