Perhaps you should try some spelling variations:
cong tkthong » cong thong, cong khong, cong thuong
nguoi con » nguoi cong, nguoi co, nguoi cor
con thong » cong thong, con hong, cong thuong
sach cha » sach che, sach ha, sach cua
thu sach » thuat sach, thuoc sach, thu hoach
le nguoi » ly nguoi, lam nguoi, den nguoi
tu sach » su sach, te sach, tu cach
cha le » cha me, ha le, cua le
te va » tu va
ve va » ve van, ke va, le va

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 nha ((ve va) OR (te va)) cong tkthong tin ) or ( thu sach cha le nguoi con thong tin ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach nha ((ve va) OR (te va)) cong tkthong tin ) OR ( thu sach cha le nguoi con thong tin )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach nha ((ve va) OR (te va)) cong tkthong tin ) or ( thu sach cha le nguoi con thong tin ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach nha ((ve va) OR (te va)) cong tkthong tin ) or ( thu sach cha le nguoi con thong tin ))*.