Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
luu tre » luu tru, luy tre
cuu tre » cua tre, cau tren, cau treo
dam tu » nam tu, cam tu, tam tu

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 ty xang xa hoi. hieu va ((nam thuc) OR (dam tu)) van hanh vi ((luu tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang xa hoi. hieu va ((nam thuc) or (dam tu)) van hanh vi ((luu tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu va ((nam thuc) or (dam tu)) van hanh vi ((luu tre) OR (cuu tre))*.