Perhaps you should try some spelling variations:
thuong thuyet » thuong thiet, thuong huyen, trong thuyet
thuong thuat » thuong thuc, trong thuat, thuong thiet
thong cong » trong cong, tong cong, thong thong
chau tinh » cuu tinh, cua tinh, cac tinh
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
ha tinh » va tinh, may tinh

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

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