Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
hanh trung » hanh trang, manh trung, danh trung
hoc chiet » hoc thiet, hoc nhiet, hoc hien
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - ((hanh trung) or (thanh trung)) cua dung cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - ((hanh trung) OR (thanh trung)) cua dung cong san ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - ((hanh trung) or (thanh trung)) cua dung cong san ((toan cau) or (toan tap))*.