Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
cua tre » cua te, cuu tre, cua triet
va hang » van hang, va nang, va lang
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
van lam » van nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty lang) or (ty hang)) xa hoi. hieu van lam thuoc va hang va ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (ty hang)) xa hoi. hieu van lam thuoc va hang va ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (ty hang)) xa hoi. hieu van lam thuoc va hang va ((cua tre) or (su triet))*.