Perhaps you should try some spelling variations:
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
san than » sang than, san thanh, van than
ban than » ban thanh, van thanh, ban hang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((trinh cua) OR (tinh cua)) thong cong ((san than) OR (ban than)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh ((trinh cua) OR (tinh cua)) thong cong ((san than) or (ban than)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh ((trinh cua) OR (tinh cua)) thong cong ((san than) or (ban than)) ban*.