Perhaps you should try some spelling variations:
thuoc cach » thuoc sach, thuc cach, truoc cach
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
lang van » dang van, tang van, hoang van
tai cuu » tai cuc, tai buu, tai cua
cach tu » cach thuc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
cuu tre » cua tre, cau tren, cau treo
co tuc » co thuc, co tu, do tuc
co toc » cao toc, co hoc, co doc

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

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