Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
lang van » dang van, tang van, hoang van
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
tai cay » tai cac, tao cay, tac cay
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) tu ((xang xa) or (lang van)) hoi. hieu va cam xuc van hanh tai cay thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) tu ((xang xa) OR (lang van)) hoi. hieu va cam xuc van hanh tai cay thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) tu ((xang xa) or (lang van)) hoi. hieu va cam xuc van hanh tai cay thuoc".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) tu ((xang xa) or (lang van)) hoi. hieu va cam xuc van hanh tai cay thuoc*.