Perhaps you should try some spelling variations:
nguoi cong » nguoi muong, nguoi thong, nguoi nung
cong thong » cong thuong, cong trong, dong thong
nguoi hoi » nguoi khoi, nguoi moi, nguoi noi
hoi thong » hoi thuong, hoi trong, hoa thong
sach cha » sach nha, sach che, sach ha
me nguoi » ma nguoi, le nguoi, moi nguoi
ke nguoi » le nguoi, ky nguoi, khoe nguoi
so sach » so sanh, bo sach, co sach
vu sach » vu bach, vu khach
ca ke » cac ke, ca ve, ca me

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach cha me nguoi cong thong tin ) or ( ((su sach) OR (vu sach)) ca ke nguoi hoi thong tin ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach cha me nguoi cong thong tin ) OR ( ((su sach) OR (vu sach)) ca ke nguoi hoi thong tin )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach cha me nguoi cong thong tin ) or ( ((su sach) OR (vu sach)) ca ke nguoi hoi thong tin ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach cha me nguoi cong thong tin ) or ( ((su sach) OR (vu sach)) ca ke nguoi hoi thong tin ))*.