Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu tinh » trieu tinh, lieu tinh, chau tinh
cua sinh » hoa sinh, va sinh
chinh ve » chinh va, chinh vi, chinh ke
ve nhung » va nhung, tu nhung
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan

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 (cua sinh)) - hanh chinh ve nhung cong ((san toan) or (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (cua sinh)) - hanh chinh ve nhung cong ((san toan) OR (dan toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (cua sinh)) - hanh chinh ve nhung cong ((san toan) or (dan toan)) cau*.