Perhaps you should try some spelling variations:
dan thuc » dan toc
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
tu cao » cu cao, tu cac, vu cao
vi cuu » vi luu, vinh cuu

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: tu cao ky ((nang ma) OR (sang ma)) hoi. hieu va ((dan thuc) OR (am thuc)) van hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky ((nang ma) OR (sang ma)) hoi. hieu va ((dan thuc) or (am thuc)) van hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky ((nang ma) OR (sang ma)) hoi. hieu va ((dan thuc) or (am thuc)) van hanh vi cuu tre*.