Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
mai khoi » mai khoa, tai khoa, cac khoi
sach thu » sach thue, sach thieu, sach tham
cham dua » chay dua, cham giua, pham duc
hoi cua » hoi chuc
dua ban » dia ban, cua ban, qua ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
mai hoi » dai hoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet

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 thu)) nang ((mai hoi) OR (mai khoi)). hieu ve cham dua ban thanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang ((mai hoi) OR (mai khoi)). hieu ve cham dua ban thanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) nang ((mai hoi) OR (mai khoi)). hieu ve cham dua ban thanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang ((mai hoi) OR (mai khoi)). hieu ve cham dua ban thanh hoi cua tre*.