Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
va doanh » van doanh, vay doanh, va danh
ky lang » ky dang, ky tang, tay lang
van lam » van nam
cua tre » cua te, cuu tre, dua tren
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky lang) or (ky nang)) xa hoi. hieu van lam thuoc va doanh van ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky nang)) xa hoi. hieu van lam thuoc va doanh van ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky lang) or (ky nang)) xa hoi. hieu van lam thuoc va doanh van ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) or (ky nang)) xa hoi. hieu van lam thuoc va doanh van ((cua tre) OR (cua triet))*.