Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
dua ban » dia ban, qua ban, mua ban
hai cua » thai cua, dai cua, hoi cua
y tang » ky tang, 6 tang, 7 tang
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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 tang ((le hoi) or (mai hoi)). hieu ve cam ((dua ban) or (cua ban)) thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y tang ((le hoi) OR (mai hoi)). hieu ve cam ((dua ban) OR (cua ban)) thanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach y tang ((le hoi) or (mai hoi)). hieu ve cam ((dua ban) or (cua ban)) thanh hai cua te*.