Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
xang mai » lang mai, sang mai, hoang mai
qua pham » quan pham, quy pham, qua cham
ban hanh » ban hang
su triet » su viet, su tien, ve triet
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
tai su » tai so, tai tu, lai su

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 ty xang mai hoi. hieu qua pham duc ((van thanh) or (ban hanh)) tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang mai hoi. hieu qua pham duc ((van thanh) OR (ban hanh)) tai su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang mai hoi. hieu qua pham duc ((van thanh) or (ban hanh)) tai su triet*.