Perhaps you should try some spelling variations:
hieu hien » dieu hien, chieu chien, dieu khien
ban thanh » ban hanh, ban hang
bieu hien » dieu hien, dieu khien, bien phien
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
nang dai » nang dau, nang tai, lang dai
cac xuc » cac nuoc, chat xuc, cac cuoc
dai hoi » dai hoc, dai hai, dai moi
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di 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 y nang dai hoi. ((hieu hien) OR (bieu hien)) ((cac xuc) or (cam xuc)) ban thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang dai hoi. ((hieu hien) OR (bieu hien)) ((cac xuc) OR (cam xuc)) ban thanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang dai hoi. ((hieu hien) OR (bieu hien)) ((cac xuc) or (cam xuc)) ban thanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang dai hoi. ((hieu hien) OR (bieu hien)) ((cac xuc) or (cam xuc)) ban thanh vi cua viet*.