Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
xay hanh » day nhanh, day thanh, xanh hanh
hanh tai » thanh tai, hang tai, han tai
cuc tre » duc tre, cua tre, cuu tre
sac ky » cac ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sai ky)) nang o hoi. lieu va ((nam thuc) OR (nam thuoc)) xay hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) nang o hoi. lieu va ((nam thuc) OR (nam thuoc)) xay hanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sai ky)) nang o hoi. lieu va ((nam thuc) OR (nam thuoc)) xay hanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) nang o hoi. lieu va ((nam thuc) OR (nam thuoc)) xay hanh tai cuc tre*.