Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ve » hanh ve, thanh va, thanh vien
thu sach » thuat sach, thuoc sach, thu hoach
dang van » hoang van, hang va
tang van » hoang van, trong van, tang luan
tu sach » su sach, te sach, tu cach
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
ve cua » le cua, de cua, te cua

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