Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
cap nuoc » dat nuoc
cua viet » ca viet, hoa viet, cua vat
lai hoi » dai hoi, lai hoa, lai roi
sach ty » sach y, sach tu, sach thu
mai doi » moi doi, mai hoi, mai khoi
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
di cua » dai cua, doi cua, de cua

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 ty nang ((mai doi) or (lai hoi)). hieu hien ((cap nuoc) or (cam xuc)) van thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((mai doi) OR (lai hoi)). hieu hien ((cap nuoc) OR (cam xuc)) van thanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((mai doi) or (lai hoi)). hieu hien ((cap nuoc) or (cam xuc)) van thanh di cua viet*.