Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cap nuoc » dat nuoc
van hanh » van thanh, ban hanh, van anh
nang lai » nang tai, mang lai, nang cai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lai hoi » dai hoi, lai hoa, lai roi
ty nang » ky nang, ty xang, ty hang
vi ca » vit ca, li ca, vi ha
va ca » va cac, va cao, va cai

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