Perhaps you should try some spelling variations:
biet nguoi » giet nguoi, dien nguoi, biet noi
nha thuoc » nha nuoc, nhan thuc, nha hoc
biet nghi » viet nghin, biet noi, biet nhe
bai duoc » bai doc, ban duoc, mai duoc
vu sach » vu bach, su sach, vu khach
so sach » so sanh, bo sach, co sach
duoc va » nuoc va, duc va, duoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) nha thuoc ((biet nghi) OR (biet nguoi)) cua ets : nhung bai duoc va đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) nha thuoc ((biet nghi) OR (biet nguoi)) cua ets : nhung bai duoc va đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sach)) nha thuoc ((biet nghi) OR (biet nguoi)) cua ets : nhung bai duoc va đai".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) nha thuoc ((biet nghi) OR (biet nguoi)) cua ets : nhung bai duoc va đai*.