Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu san » hieu van, hieu sau, chieu sang
van hanh » ban hanh, van ban, van minh
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 » 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 ((van hanh) or (((van anh) OR (van thanh)))) 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 ((van hanh) OR (((van anh) OR (van thanh)))) dan su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu san pham duc ((van hanh) or (((van anh) OR (van thanh)))) dan su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu san pham duc ((van hanh) or (((van anh) OR (van thanh)))) dan su triet*.