Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
luat tuc » luat thue
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve luat » va luat, ve thuat
su tien » su kien, su hien, tu tieng
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu ve luat tuc ((va dao) or (ca dao)) vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ve luat tuc ((va dao) OR (ca dao)) vi su tien.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ve luat tuc ((va dao) or (ca dao)) vi su tien*.