Perhaps you should try some spelling variations:
theo chuong » theo phuong, theo luong
trinh tinh » trinh kinh, trinh dinh, trinh sinh
thanh tung » thanh cong
cho chuong » cho cong, cho truong, cac chuong
trinh tin » trinh kinh, trinh toan, trinh tu
dang san » dang van, dong san, dung san
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((trinh tinh) or (trinh tin)) - thanh tung ((cho chuong) OR (theo chuong)) dang san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((trinh tinh) OR (trinh tin)) - thanh tung ((cho chuong) OR (theo chuong)) dang san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((trinh tinh) or (trinh tin)) - thanh tung ((cho chuong) OR (theo chuong)) dang san van ban".
• Adding a wildcard symbol may retrieve word variants: doc ((trinh tinh) or (trinh tin)) - thanh tung ((cho chuong) OR (theo chuong)) dang san van ban*.