Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hoa lang » hoa dan, hoa van
va triet » va thiet, va trien, ve triet
qua cua » quan cua, quang cua, qua quan
va hang » van hang, va nang, va lang
so sanh » do sanh
o lang » hoi lang
y lang » _ lang, tay lang, yen lang
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ((y lang) OR (o lang)) xa hoi. hieu qua cua thuoc ((va hang) or (hoa lang)) di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ((y lang) OR (o lang)) xa hoi. hieu qua cua thuoc ((va hang) OR (hoa lang)) di va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ((y lang) OR (o lang)) xa hoi. hieu qua cua thuoc ((va hang) or (hoa lang)) di va triet*".