Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
tvan tai » toan tai, tan tai, tuan tai
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
van tai » von tai, van tuan
san ky » sang ky, van ky, dan ky
cua te » cua tu

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 lang xa hoi. hieu va ((nam thuc) or (am thuc)) va ((van tai) or (tvan tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky lang xa hoi. hieu va ((nam thuc) OR (am thuc)) va ((van tai) OR (tvan tai)) cua te.
• Adding a wildcard symbol may retrieve word variants: toc san ky lang xa hoi. hieu va ((nam thuc) or (am thuc)) va ((van tai) or (tvan tai)) cua te*.