Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
trinh quan » tinh quang, trinh han
tong cong » trong cong, cong cong, dung cong
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 ((chieu tinh) or (ha tinh)) - hanh ((trinh quan) or (trinh luat)) tong cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (ha tinh)) - hanh ((trinh quan) OR (trinh luat)) tong cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (ha tinh)) - hanh ((trinh quan) or (trinh luat)) tong cong san toan ban*.