Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang van » hoang van, hang va
tang van » hoang van, trong van, tang luan
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ve cam » ve cham, ve cac, va cam
ve cua » le cua, te cua, ve cum
de cua » le cua, te cua, dieu 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 ty ((dang van) or (tang van)) hoi. hieu ve cam tuc ban thanh ((ve cua) OR (de cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((dang van) OR (tang van)) hoi. hieu ve cam tuc ban thanh ((ve cua) OR (de cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((dang van) or (tang van)) hoi. hieu ve cam tuc ban thanh ((ve cua) OR (de cua)) vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((dang van) or (tang van)) hoi. hieu ve cam tuc ban thanh ((ve cua) OR (de cua)) vat*.