Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
day thanh » dao thanh, dat thanh, dam thanh
da thanh » dao thanh, dat thanh, dam thanh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
doi cuu » doi cua, doi cuoc
cuu tre » cua tre, cau tren, cau treo
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc san ky nang xa hoi. hieu va ((nam thuoc) or (nam thu)) ((day thanh) OR (da thanh)) doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky nang xa hoi. hieu va ((nam thuoc) OR (nam thu)) ((day thanh) OR (da thanh)) doi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc san ky nang xa hoi. hieu va ((nam thuoc) or (nam thu)) ((day thanh) OR (da thanh)) doi cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc san ky nang xa hoi. hieu va ((nam thuoc) or (nam thu)) ((day thanh) OR (da thanh)) doi cuu tre*.