Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
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
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
van anh » tuan anh, van minh
tai su » tai so, tai tu, lai su

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