Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu sang » thu hang, thu san, thu bang
sang tao » hang tai
te sach » toc sach
danh vi » hanh vi, dinh vi, danh di
hieu ve » hieu va, hieu van
tao hoi » tao khoi, tao boi, tay hoi
luc va » duc va, tuc va
loc va » hoc va
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu sang tao hoi. ((hieu ve) OR (hieu qua)) cam ((luc va) OR (loc va)) danh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu sang tao hoi. ((hieu ve) or (hieu qua)) cam ((luc va) OR (loc va)) danh vi cua vat~".
• Adding a wildcard symbol may retrieve word variants: te sach thu sang tao hoi. ((hieu ve) or (hieu qua)) cam ((luc va) OR (loc va)) danh vi cua vat*.