Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
nha thuoc » nha nuoc, nhan thuc, nha hoc
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
hai cau » hai chau, hai chu, hai hau
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ty nang x ho. hieu ve ((cam tu) or (nha thuoc)) ban thanh hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ty nang x ho. hieu ve ((cam tu) OR (nha thuoc)) ban thanh hai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ty nang x ho. hieu ve ((cam tu) or (nha thuoc)) ban thanh hai cau tren*.