Perhaps you should try some spelling variations:
trong thuat » trong hoat, trong thu, trong phat
tung thuat » thuong thuat, vuong thuat, vung thua
tvqg thuat » tvqg thuyet, tvqg thuc, tvqg phat
dung minh » duong minh, dung ninh, dung vinh
minh toan » tinh toan, manh toan, minh tuan
chi sach » chinh sach, chieu sach, co sach
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - thanh ((((tung thuat) OR (tvqg thuat))) or (trong thuat)) ung dung minh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - thanh ((((tung thuat) OR (tvqg thuat))) OR (trong thuat)) ung dung minh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi sach - thanh ((((tung thuat) OR (tvqg thuat))) or (trong thuat)) ung dung minh toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chi sach - thanh ((((tung thuat) OR (tvqg thuat))) or (trong thuat)) ung dung minh toan cau*.