Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » ca viet, hoa viet, cua vat
thanh di » thanh doi, thanh de, thanh do
xa thanh » va thanh, ha thanh, ta thanh
cham tuc » pham thuc, tham thuc, cham soc
hieu ve » hieu va, hieu van
co sach » bo sach, cuon sach, hoc sach
tu sach » thu sach, su sach, te sach
di cua » dai cua, doi cua, de cua
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: ((tu sach) or (co sach)) ky nang x hoi. hieu ve ((cham tuc) OR (nham thuc)) xa thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang x hoi. hieu ve ((cham tuc) OR (nham thuc)) xa thanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (co sach)) ky nang x hoi. hieu ve ((cham tuc) OR (nham thuc)) xa thanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang x hoi. hieu ve ((cham tuc) OR (nham thuc)) xa thanh di cua viet*.