Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
thuc van » thuc vat, thuc dan, thuc va
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ma hoi » mai hoi, xa hoi, ma 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: thu sach ((ky sang) OR (ky dang)) ma hoi. hieu ve cam thuc van thanh vi ((cua viet) OR (ve triet))~.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky dang)) ma hoi. hieu ve cam thuc van thanh vi ((cua viet) or (ve triet))*.