Perhaps you should try some spelling variations:
van thanh » van tuan
nham thuc » nhan thuc, nam thuc, nham thu
ban thanh » ban hanh, ban hang
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
ca viet » va viet, hoa viet, san viet
co viet » so viet, o viet, hoc viet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang x hoi. hieu ve nham thuc ((van thanh) OR (ban thanh)) li ((ca viet) or (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. hieu ve nham thuc ((van thanh) OR (ban thanh)) li ((ca viet) OR (co viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. hieu ve nham thuc ((van thanh) OR (ban thanh)) li ((ca viet) or (co viet))*".