Perhaps you should try some spelling variations:
nguoi thong » nguoi muong, nguoi thanh
nguoi cong » nguoi muong, nguoi nung, nguoi dung
thong tinh » thuong tinh, thong tin, thong minh
sach cha » sach nha, sach ha, sach cua
sach che » sach thue, sach nha, sach cap
nguoi co » nguoi do, nguoi dao, nguoi moi

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

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