Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
cap nuoc » dat nuoc
nang lai » nang tai, mang lai, nang cai
sach ty » sach tu, sach thu, xach tay
lai hoi » dai hoi, lai hoa, lai roi
ca viet » va viet, co viet, hoa viet
vi ca » vit ca, li ca, va ca

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) OR (sach y)) nang lai hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang lai hoi. hieu hien ((cap nuoc) OR (cam xuc)) van hanh vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang lai hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi ca viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang lai hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi ca viet*.