Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
cam thuc » am thuc, nam thuc, cam thu
dang xay » dang van, van xay
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tuc » cua duc, cua tu, cua thuoc
lang xa » lang ha, lang van
va cam » va cham, va cac, va cao

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) OR (toc sach)) o ((lang xa) OR (dang xay)) hoi. hieu va cam thuc va hanh vai cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) o ((lang xa) or (dang xay)) hoi. hieu va cam thuc va hanh vai cua tuc~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) o ((lang xa) or (dang xay)) hoi. hieu va cam thuc va hanh vai cua tuc*.