Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, lieu va, hieu ve
tu cach » tu cac
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
nam duc » nam duoc, pham duc, nam thuc
cach xu » cach tu, cach su, mach xu
lang xa » lang ha, dang xay, lang van
xu lang » cu lang, tu lang, xu dang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach xu lang xa hoi. ((hieu van) or (thien van)) ((nam duc) or (nam thuoc)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach xu lang xa hoi. ((hieu van) OR (thien van)) ((nam duc) OR (nam thuoc)) va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cach xu lang xa hoi. ((hieu van) or (thien van)) ((nam duc) or (nam thuoc)) va hanh tai cua tre*.