Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
toc sach » hoc sach, doc sach, thuoc sach
mai khoi » mai khoa, tai khoa, cac khoi
cam dua » ca dua, cay dua, chay dua
cuc tre » duc tre, cuu tre, cuc thue
dua ban » dia ban, cua ban, qua ban
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
mai hoi » dai hoi, lai hoi, mai doi
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

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