Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
nhung cong » dung cong, thong cong, hang cong
chau tinh » cuu tinh, cua tinh, cac tinh
tinh cua » trinh cua, sinh cua, tinh chat
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, 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 ((trinh luan) or (tinh cua)) nhung cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (ha tinh)) - hanh ((trinh luan) OR (tinh cua)) nhung cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chau tinh) OR (ha tinh)) - hanh ((trinh luan) or (tinh cua)) nhung cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) OR (ha tinh)) - hanh ((trinh luan) or (tinh cua)) nhung cong dan toan ban*.