Perhaps you should try some spelling variations:
cong suc » cong thuc, cong suat, cong chuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dan vai » dan va, dan tai, dan vat
su hien » su kien, su tien, thu hien
co suc » cao suc, co su
ca dan » cac dan, ca dao
vai su » va su, van su, 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 qua ((co suc) OR (cong suc)) ca dan vai su hien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu qua ((co suc) OR (cong suc)) ca dan vai su hien".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu qua ((co suc) OR (cong suc)) ca dan vai su hien*.