Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
sach duy » sach dung, sach duoc, sach dao
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
van mai » van hai, van ai, ban mai
duy van » duy vat, dung van
dan cua » dan ca, ban cua, dai cua
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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: su sach duy van mai hoi. ((hieu ve) OR (hieu va)) cam ((luc va) OR (tuc va)) thanh dan cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach duy van mai hoi. ((hieu ve) or (hieu va)) cam ((luc va) OR (tuc va)) thanh dan cua vat~".
• Adding a wildcard symbol may retrieve word variants: su sach duy van mai hoi. ((hieu ve) or (hieu va)) cam ((luc va) OR (tuc va)) thanh dan cua vat*.