Perhaps you should try some spelling variations:
nguoi cong » nguoi muong, nguoi thong, nguoi nung
cong thong » cong thuong, cong trong, dong thong
khong tin » khong ton, khuong tinh, khong gian
noi khong » khoi khong, noi khoa, doi khang
nguoi noi » nguoi moi, nguoi nuoc, nguoi co
me nguoi » ma nguoi, le nguoi, moi nguoi
ke nguoi » le nguoi, ky nguoi, khoe nguoi
sach cha » sach nha, sach che, sach ha
sach xa » sach dao, sach nha, sach bai
so sach » so sanh, bo sach, co sach
sach ca » sach cap, sach cua, sach ha

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 ca) OR (sach xa)) ke nguoi noi khong 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 ca) OR (sach xa)) ke nguoi noi khong 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 ca) OR (sach xa)) ke nguoi noi khong tin ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach cha me nguoi cong thong tin ) or ( su ((sach ca) OR (sach xa)) ke nguoi noi khong tin ))*.