Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
chong phap » phuong phap
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
phap phan » phap phat, phap hoan, phap luan
ho chiet » ho chieu, ho thiet, hoc thiet
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - thanh trung ((cua khong) or (hua khong)) chong phap phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh trung ((cua khong) OR (hua khong)) chong phap phan cau.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh trung ((cua khong) or (hua khong)) chong phap phan cau*.