Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chiet tach » chieu sach
chieu tinh » trieu tinh, lieu tinh, chau tinh
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than ban » thanh ban, toan ban, than man

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

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