Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
hieu ve » hieu va, hieu van
bai cua » ban cua, bai ca, hai cua
sach o » sach lo, sach y, mach o
va hoi » xa hoi, va hoc, va hoa
ve cam » ve cham, ve cac, va cam

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: toc ((sach o) OR (sac o)) hang va hoi. hieu ve cam thuc van thanh ((bai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach o) OR (sac o)) hang va hoi. hieu ve cam thuc van thanh ((bai cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach o) OR (sac o)) hang va hoi. hieu ve cam thuc van thanh ((bai cua) or (dai cua)) tre*.