Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
dai hoi » dai hoc, dai hai, dai moi
ly nang » ky nang, ly hang, ly vang
cac xuc » cac nuoc, chat xuc, cac cuoc
su sach » so sach, vu sach
y nang » ky nang, v nang, may 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: su sach ((y nang) or (ly nang)) dai hoi. hieu hien ((cac xuc) or (cam xuc)) ban thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) dai hoi. hieu hien ((cac xuc) OR (cam xuc)) ban thanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) dai hoi. hieu hien ((cac xuc) or (cam xuc)) ban thanh vi cua viet*.