Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
nam duoc » da duoc, dat duoc, nam moc
thanh vi » thanh va, thanh ve, nhanh vi
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan ky
phi » phai

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

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